[PATCH 1/1] i2c: Add default configuration into the Nomadik I2C driver.

[PATCH 1/1] i2c: Add default configuration into the Nomadik I2C driver.

[Lee Jones]

At this moment in time there is only one known configuration for the
Nomadik I2C driver. By not holding that configuration in the driver
adds some unnecessary overhead in platform code. The configuration
as already been removed from platform code, this patch checks for any
over-riding configurations. If there aren't any, the default is used.

Cc: linux-i2c@vger.kernel.org
Acked-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/i2c/busses/i2c-nomadik.c |   28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 5e6f1ee..e42e526 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -350,10 +350,6 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
 
 	i2c_clk = clk_get_rate(dev->clk);
 
-	/* fallback to std. mode if machine has not provided it */
-	if (dev->cfg.clk_freq == 0)
-		dev->cfg.clk_freq = 100000;
-
 	/*
 	 * The spec says, in case of std. mode the divider is
 	 * 2 whereas it is 3 for fast and fastplus mode of
@@ -911,20 +907,32 @@ static const struct i2c_algorithm nmk_i2c_algo = {
 	.functionality	= nmk_i2c_functionality
 };
 
+static struct nmk_i2c_controller u8500_i2c = {
+	/*
+	 * Slave data setup time; 250ns, 100ns, and 10ns, which
+	 * is 14, 6 and 2 respectively for a 48Mhz i2c clock.
+	 */
+	.slsu           = 0xe,
+	.tft            = 1,      /* Tx FIFO threshold */
+	.rft            = 8,      /* Rx FIFO threshold */
+	.clk_freq       = 400000, /* fast mode operation */
+	.timeout        = 200,    /* Slave response timeout(ms) */
+	.sm             = I2C_FREQ_MODE_FAST,
+};
+
 static atomic_t adapter_id = ATOMIC_INIT(0);
 
 static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret = 0;
-	struct nmk_i2c_controller *pdata =
-			adev->dev.platform_data;
+	struct nmk_i2c_controller *pdata = pdev->dev.platform_data;
 	struct nmk_i2c_dev	*dev;
 	struct i2c_adapter *adap;
 
-	if (!pdata) {
-		dev_warn(&adev->dev, "no platform data\n");
-		return -ENODEV;
-	}
+	if (!pdata)
+		/* No i2c configuration found, using the default. */
+		pdata = &u8500_i2c;
+
 	dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL);
 	if (!dev) {
 		dev_err(&adev->dev, "cannot allocate memory\n");
-- 
1.7.9.5

[PATCH 1/1 v2] i2c: Add default configuration into the Nomadik I2C driver.

[Lee Jones]

Looks like I introduced a merge error on the last patch. Trying again:

From: Lee Jones <lee.jones@linaro.org>
Date: Mon, 6 Aug 2012 11:04:14 +0100
Subject: [PATCH 1/1 v2] i2c: Add default configuration into the Nomadik I2C
 driver.

At this moment in time there is only one known configuration for the
Nomadik I2C driver. By not holding that configuration in the driver
adds some unnecessary overhead in platform code. The configuration
as already been removed from platform code, this patch checks for any
over-riding configurations. If there aren't any, the default is used.

Cc: linux-i2c@vger.kernel.org
Acked-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 .../mali/mali400ko/driver/src/devicedrv/mali/arch  |    1 +
 drivers/i2c/busses/i2c-nomadik.c                   |   28 +++++++++++++-------
 2 files changed, 19 insertions(+), 10 deletions(-)
 create mode 120000 drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch

diff --git a/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch b/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch
new file mode 120000
index 0000000..427334b
--- /dev/null
+++ b/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch
@@ -0,0 +1 @@
+/home/ljkenny/projects/linaro/snowball/snowball/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch-ux500
\ No newline at end of file
diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 5e6f1ee..61b00ed 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -350,10 +350,6 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
 
 	i2c_clk = clk_get_rate(dev->clk);
 
-	/* fallback to std. mode if machine has not provided it */
-	if (dev->cfg.clk_freq == 0)
-		dev->cfg.clk_freq = 100000;
-
 	/*
 	 * The spec says, in case of std. mode the divider is
 	 * 2 whereas it is 3 for fast and fastplus mode of
@@ -911,20 +907,32 @@ static const struct i2c_algorithm nmk_i2c_algo = {
 	.functionality	= nmk_i2c_functionality
 };
 
+static struct nmk_i2c_controller u8500_i2c = {
+	/*
+	 * Slave data setup time; 250ns, 100ns, and 10ns, which
+	 * is 14, 6 and 2 respectively for a 48Mhz i2c clock.
+	 */
+	.slsu           = 0xe,
+	.tft            = 1,      /* Tx FIFO threshold */
+	.rft            = 8,      /* Rx FIFO threshold */
+	.clk_freq       = 400000, /* fast mode operation */
+	.timeout        = 200,    /* Slave response timeout(ms) */
+	.sm             = I2C_FREQ_MODE_FAST,
+};
+
 static atomic_t adapter_id = ATOMIC_INIT(0);
 
 static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret = 0;
-	struct nmk_i2c_controller *pdata =
-			adev->dev.platform_data;
+	struct nmk_i2c_controller *pdata = adev->dev.platform_data;
 	struct nmk_i2c_dev	*dev;
 	struct i2c_adapter *adap;
 
-	if (!pdata) {
-		dev_warn(&adev->dev, "no platform data\n");
-		return -ENODEV;
-	}
+	if (!pdata)
+		/* No i2c configuration found, using the default. */
+		pdata = &u8500_i2c;
+
 	dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL);
 	if (!dev) {
 		dev_err(&adev->dev, "cannot allocate memory\n");
-- 
1.7.9.5

Re: [PATCH 1/1 v2] i2c: Add default configuration into the Nomadik I2C driver.

[Linus Walleij]

On Mon, Aug 6, 2012 at 5:35 PM, Lee Jones <lee.jones@linaro.org> wrote:

> Looks like I introduced a merge error on the last patch. Trying again:

>  .../mali/mali400ko/driver/src/devicedrv/mali/arch  |    1 +
(...)
> diff --git a/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch b/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch
> new file mode 120000
> index 0000000..427334b
> --- /dev/null
> +++ b/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch
> @@ -0,0 +1 @@
> +/home/ljkenny/projects/linaro/snowball/snowball/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch-ux500
> \ No newline at end of file

NACK, what is this stuff? It's even out-of-tree code.

Please be careful with git add -A, I prefer to use git add <pathspec>
I suspect that may be why this happened...

Please fix it up and send a v3.

Yours,
Linus Walleij

Re: [PATCH 1/1 v2] i2c: Add default configuration into the Nomadik I2C driver.

[Lee Jones]

> > diff --git a/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch b/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch
> > new file mode 120000
> > index 0000000..427334b
> > --- /dev/null
> > +++ b/drivers/gpu/mali/mali400ko/driver/src/devicedrv/mali/arch
> > @@ -0,0 +1 @@
> 
> NACK, what is this stuff? It's even out-of-tree code.

Whoa, no idea! Good spot though, I missed this completely.

> Please be careful with git add -A, I prefer to use git add <pathspec>
> I suspect that may be why this happened...

I don't use `git add -A`, ever. If I'm adding files, I usually use 
`git commit -s -- <pathspec>`, or `git commit -a` if I'm sure I require
all the necessary changes. I guess I could have accidentally collected 
it using `git add -i` whist fixing it up, or a similar misdemeanor.

> Please fix it up and send a v3.

Of course.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

Re: [PATCH 1/1 v2] i2c: Add default configuration into the Nomadik I2C driver.

[Lee Jones]

From: Lee Jones <lee.jones@linaro.org>
Date: Tue, 7 Aug 2012 12:27:24 +0100
Subject: [PATCH 1/1 v3] i2c: Add default configuration into the Nomadik I2C
 driver.

At this moment in time there is only one known configuration for the
Nomadik I2C driver. By not holding that configuration in the driver
adds some unnecessary overhead in platform code. The configuration
as already been removed from platform code, this patch checks for any
over-riding configurations. If there aren't any, the default is used.

Cc: linux-i2c@vger.kernel.org
Acked-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/i2c/busses/i2c-nomadik.c |   28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 5e6f1ee..61b00ed 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -350,10 +350,6 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
 
 	i2c_clk = clk_get_rate(dev->clk);
 
-	/* fallback to std. mode if machine has not provided it */
-	if (dev->cfg.clk_freq == 0)
-		dev->cfg.clk_freq = 100000;
-
 	/*
 	 * The spec says, in case of std. mode the divider is
 	 * 2 whereas it is 3 for fast and fastplus mode of
@@ -911,20 +907,32 @@ static const struct i2c_algorithm nmk_i2c_algo = {
 	.functionality	= nmk_i2c_functionality
 };
 
+static struct nmk_i2c_controller u8500_i2c = {
+	/*
+	 * Slave data setup time; 250ns, 100ns, and 10ns, which
+	 * is 14, 6 and 2 respectively for a 48Mhz i2c clock.
+	 */
+	.slsu           = 0xe,
+	.tft            = 1,      /* Tx FIFO threshold */
+	.rft            = 8,      /* Rx FIFO threshold */
+	.clk_freq       = 400000, /* fast mode operation */
+	.timeout        = 200,    /* Slave response timeout(ms) */
+	.sm             = I2C_FREQ_MODE_FAST,
+};
+
 static atomic_t adapter_id = ATOMIC_INIT(0);
 
 static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret = 0;
-	struct nmk_i2c_controller *pdata =
-			adev->dev.platform_data;
+	struct nmk_i2c_controller *pdata = adev->dev.platform_data;
 	struct nmk_i2c_dev	*dev;
 	struct i2c_adapter *adap;
 
-	if (!pdata) {
-		dev_warn(&adev->dev, "no platform data\n");
-		return -ENODEV;
-	}
+	if (!pdata)
+		/* No i2c configuration found, using the default. */
+		pdata = &u8500_i2c;
+
 	dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL);
 	if (!dev) {
 		dev_err(&adev->dev, "cannot allocate memory\n");
-- 
1.7.9.5

Re: [PATCH 1/1 v2] i2c: Add default configuration into the Nomadik I2C driver.

[Linus Walleij]

On Tue, Aug 7, 2012 at 5:31 PM, Lee Jones <lee.jones@linaro.org> wrote:

> From: Lee Jones <lee.jones@linaro.org>
> Date: Tue, 7 Aug 2012 12:27:24 +0100
> Subject: [PATCH 1/1 v3] i2c: Add default configuration into the Nomadik I2C
>  driver.

This has some bad whitespace damage, and the subject should
be "i2c/nomadik:"

> Cc: linux-i2c@vger.kernel.org
> Acked-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
> Acked-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>

Double sign-off.

Unless Wolfram volunteers to fix this up I suggest you
fix it nocheinmal und senden einer neues version.

Ihre,
Linus Walleij

Re: [PATCH 1/1 v2] i2c: Add default configuration into the Nomadik I2C driver.

[Lee Jones]

On Wed, Aug 08, 2012 at 02:38:23PM +0200, Linus Walleij wrote:
> On Tue, Aug 7, 2012 at 5:31 PM, Lee Jones <lee.jones@linaro.org> wrote:
> 
> > From: Lee Jones <lee.jones@linaro.org>
> > Date: Tue, 7 Aug 2012 12:27:24 +0100
> > Subject: [PATCH 1/1 v3] i2c: Add default configuration into the Nomadik I2C
> >  driver.
> 
> This has some bad whitespace damage, and the subject should
> be "i2c/nomadik:"

White space damage? You mean the subject line-wrap? 

`git format-patch` does that. I'll change the subject line to i2c/nomadik.

> > Cc: linux-i2c@vger.kernel.org
> > Acked-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
> > Acked-by: Linus Walleij <linus.walleij@linaro.org>
> > Signed-off-by: Lee Jones <lee.jones@linaro.org>
> >
> > Signed-off-by: Lee Jones <lee.jones@linaro.org>
> 
> Double sign-off.

Hmm... this is fast becoming my nemosis patch!

> Unless Wolfram volunteers to fix this up I suggest you
> fix it nocheinmal und senden einer neues version.

That's okay, it's my error, I'll fix. 

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

[PATCH 1/1 v4] i2c: Add default configuration into the Nomadik I2C driver.

[Lee Jones]

From: Lee Jones <lee.jones@linaro.org>
Date: Tue, 7 Aug 2012 12:27:24 +0100
Subject: [PATCH 1/1 v4] i2c/nomadik: Add default configuration into the Nomadik I2C driver

At this moment in time there is only one known configuration for the
Nomadik I2C driver. By not holding that configuration in the driver
adds some unnecessary overhead in platform code. The configuration
as already been removed from platform code, this patch checks for any
over-riding configurations. If there aren't any, the default is used.

Cc: linux-i2c@vger.kernel.org
Acked-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/i2c/busses/i2c-nomadik.c |   28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index 5e6f1ee..61b00ed 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -350,10 +350,6 @@ static void setup_i2c_controller(struct nmk_i2c_dev *dev)
 
 	i2c_clk = clk_get_rate(dev->clk);
 
-	/* fallback to std. mode if machine has not provided it */
-	if (dev->cfg.clk_freq == 0)
-		dev->cfg.clk_freq = 100000;
-
 	/*
 	 * The spec says, in case of std. mode the divider is
 	 * 2 whereas it is 3 for fast and fastplus mode of
@@ -911,20 +907,32 @@ static const struct i2c_algorithm nmk_i2c_algo = {
 	.functionality	= nmk_i2c_functionality
 };
 
+static struct nmk_i2c_controller u8500_i2c = {
+	/*
+	 * Slave data setup time; 250ns, 100ns, and 10ns, which
+	 * is 14, 6 and 2 respectively for a 48Mhz i2c clock.
+	 */
+	.slsu           = 0xe,
+	.tft            = 1,      /* Tx FIFO threshold */
+	.rft            = 8,      /* Rx FIFO threshold */
+	.clk_freq       = 400000, /* fast mode operation */
+	.timeout        = 200,    /* Slave response timeout(ms) */
+	.sm             = I2C_FREQ_MODE_FAST,
+};
+
 static atomic_t adapter_id = ATOMIC_INIT(0);
 
 static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret = 0;
-	struct nmk_i2c_controller *pdata =
-			adev->dev.platform_data;
+	struct nmk_i2c_controller *pdata = adev->dev.platform_data;
 	struct nmk_i2c_dev	*dev;
 	struct i2c_adapter *adap;
 
-	if (!pdata) {
-		dev_warn(&adev->dev, "no platform data\n");
-		return -ENODEV;
-	}
+	if (!pdata)
+		/* No i2c configuration found, using the default. */
+		pdata = &u8500_i2c;
+
 	dev = kzalloc(sizeof(struct nmk_i2c_dev), GFP_KERNEL);
 	if (!dev) {
 		dev_err(&adev->dev, "cannot allocate memory\n");
-- 
1.7.9.5

Re: [PATCH 1/1 v4] i2c: Add default configuration into the Nomadik I2C driver.

[Linus Walleij]

On Wed, Aug 8, 2012 at 3:11 PM, Lee Jones <lee.jones@linaro.org> wrote:

> From: Lee Jones <lee.jones@linaro.org>
> Date: Tue, 7 Aug 2012 12:27:24 +0100
> Subject: [PATCH 1/1 v4] i2c/nomadik: Add default configuration into the Nomadik I2C driver

Wolfram are you taking this v4 patch into the i2c tree for the -rc:s?

Right now this is causing boot regressions so we need it badly...

Yours,
Linus Walleij

Re: [PATCH 1/1 v4] i2c: Add default configuration into the Nomadik I2C driver.

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 683 bytes --]

On Fri, Aug 17, 2012 at 05:02:32PM +0200, Linus Walleij wrote:
> On Wed, Aug 8, 2012 at 3:11 PM, Lee Jones <lee.jones@linaro.org> wrote:
> 
> > From: Lee Jones <lee.jones@linaro.org>
> > Date: Tue, 7 Aug 2012 12:27:24 +0100
> > Subject: [PATCH 1/1 v4] i2c/nomadik: Add default configuration into the Nomadik I2C driver
> 
> Wolfram are you taking this v4 patch into the i2c tree for the -rc:s?
> 
> Right now this is causing boot regressions so we need it badly...

I am collecting patches for rc3 this weekend.

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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Re: [PATCH 1/1 v4] i2c: Add default configuration into the Nomadik I2C driver.

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 1219 bytes --]

On Wed, Aug 08, 2012 at 02:11:59PM +0100, Lee Jones wrote:
> From: Lee Jones <lee.jones@linaro.org>
> Date: Tue, 7 Aug 2012 12:27:24 +0100
> Subject: [PATCH 1/1 v4] i2c/nomadik: Add default configuration into the Nomadik I2C driver

Actually, unlike Linus said, I prefer "i2c: nomadik:"; minor nit,
though.

> 
> At this moment in time there is only one known configuration for the
> Nomadik I2C driver. By not holding that configuration in the driver
> adds some unnecessary overhead in platform code. The configuration
> as already been removed from platform code, this patch checks for any

  ^^ has ( I fixed it )

> over-riding configurations. If there aren't any, the default is used.
> 
> Cc: linux-i2c@vger.kernel.org
> Acked-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
> Acked-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>

Applied to -current, thanks! I added a note from Linus that it is needed
because of boot regressions. That is also useful in commit messages.

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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