[PATCH 0/4] pinctrl: bcm2835: Support for wake-up interrupts

[PATCH 0/4] pinctrl: bcm2835: Support for wake-up interrupts

[Florian Fainelli]

Hi Linus,

This patch series updates the bcm2835 pinctrl driver to support
the BCM7211 SoC which is quite similar to 2711 (Raspberry Pi 4)
except that it also supports wake-up interrupts.

Thanks!

Florian Fainelli (4):
  dt-bindings: pinctrl: Document 7211 compatible for
    brcm,bcm2835-gpio.txt
  dt-bindings: pinctrl: Document optional BCM7211 wake-up interrupts
  pinctrl: bcm2835: Match BCM7211 compatible string
  pinctrl: bcm2835: Add support for wake-up interrupts

 .../bindings/pinctrl/brcm,bcm2835-gpio.txt    |  5 +-
 drivers/pinctrl/bcm/pinctrl-bcm2835.c         | 62 ++++++++++++++++++-
 2 files changed, 65 insertions(+), 2 deletions(-)

-- 
2.17.1

[PATCH 1/4] dt-bindings: pinctrl: Document 7211 compatible for brcm,bcm2835-gpio.txt

[Florian Fainelli]

Document the brcm,bcm7211-gpio compatible string in the
brcm,bcm2835-gpio.txt document.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
index 3cab7336a326..dfc67b90591c 100644
--- a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
@@ -9,6 +9,7 @@ Required properties:
   "brcm,bcm2835-gpio" - BCM2835 compatible pinctrl
   "brcm,bcm7211-gpio" - BCM7211 compatible pinctrl
   "brcm,bcm2711-gpio" - BCM2711 compatible pinctrl
+  "brcm,bcm7211-gpio" - BCM7211 compatible pinctrl
 - reg: Should contain the physical address of the GPIO module's registers.
 - gpio-controller: Marks the device node as a GPIO controller.
 - #gpio-cells : Should be two. The first cell is the pin number and the
-- 
2.17.1

Re: [PATCH 1/4] dt-bindings: pinctrl: Document 7211 compatible for brcm, bcm2835-gpio.txt

[Rob Herring]

On Thu, 28 May 2020 12:21:09 -0700, Florian Fainelli wrote:
> Document the brcm,bcm7211-gpio compatible string in the
> brcm,bcm2835-gpio.txt document.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt | 1 +
>  1 file changed, 1 insertion(+)
> 

Acked-by: Rob Herring <robh@kernel.org>

[PATCH 2/4] dt-bindings: pinctrl: Document optional BCM7211 wake-up interrupts

[Florian Fainelli]

BCM7211 supports wake-up interrupts in the form of optional interrupt
lines, one per bank, plus the "all banks" interrupt line.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 .../devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt         | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
index dfc67b90591c..5682b2010e50 100644
--- a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
@@ -16,7 +16,9 @@ Required properties:
   second cell is used to specify optional parameters:
   - bit 0 specifies polarity (0 for normal, 1 for inverted)
 - interrupts : The interrupt outputs from the controller. One interrupt per
-  individual bank followed by the "all banks" interrupt.
+  individual bank followed by the "all banks" interrupt. For BCM7211, an
+  additional set of per-bank interrupt line and an "all banks" wake-up
+  interrupt may be specified.
 - interrupt-controller: Marks the device node as an interrupt controller.
 - #interrupt-cells : Should be 2.
   The first cell is the GPIO number.
-- 
2.17.1

Re: [PATCH 2/4] dt-bindings: pinctrl: Document optional BCM7211 wake-up interrupts

[Rob Herring]

On Thu, May 28, 2020 at 12:21:10PM -0700, Florian Fainelli wrote:
> BCM7211 supports wake-up interrupts in the form of optional interrupt
> lines, one per bank, plus the "all banks" interrupt line.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  .../devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt         | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
> index dfc67b90591c..5682b2010e50 100644
> --- a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
> @@ -16,7 +16,9 @@ Required properties:
>    second cell is used to specify optional parameters:
>    - bit 0 specifies polarity (0 for normal, 1 for inverted)
>  - interrupts : The interrupt outputs from the controller. One interrupt per
> -  individual bank followed by the "all banks" interrupt.
> +  individual bank followed by the "all banks" interrupt. For BCM7211, an
> +  additional set of per-bank interrupt line and an "all banks" wake-up
> +  interrupt may be specified.

Is 'all banks' the name? Generally 'wakeup' is used for a wake up irq.

Rob

Re: [PATCH 2/4] dt-bindings: pinctrl: Document optional BCM7211 wake-up interrupts

[Florian Fainelli]

On 5/29/20 12:33 PM, Rob Herring wrote:
> On Thu, May 28, 2020 at 12:21:10PM -0700, Florian Fainelli wrote:
>> BCM7211 supports wake-up interrupts in the form of optional interrupt
>> lines, one per bank, plus the "all banks" interrupt line.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>> ---
>>  .../devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt         | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
>> index dfc67b90591c..5682b2010e50 100644
>> --- a/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
>> @@ -16,7 +16,9 @@ Required properties:
>>    second cell is used to specify optional parameters:
>>    - bit 0 specifies polarity (0 for normal, 1 for inverted)
>>  - interrupts : The interrupt outputs from the controller. One interrupt per
>> -  individual bank followed by the "all banks" interrupt.
>> +  individual bank followed by the "all banks" interrupt. For BCM7211, an
>> +  additional set of per-bank interrupt line and an "all banks" wake-up
>> +  interrupt may be specified.
> 
> Is 'all banks' the name? Generally 'wakeup' is used for a wake up irq.

The firmware provided DTB on 7211 names the interrupts "gpio_%d" for the
standard interrupts, including the "all banks" which is then "gpio_3"
and the wake-up interrupts are named "gpio_%d_wake", and the all banks
wake-up is "gpio_3_wake".
-- 
Florian

[PATCH 3/4] pinctrl: bcm2835: Match BCM7211 compatible string

[Florian Fainelli]

The BCM7211 SoC uses the same pinconf_ops as the ones defined for the
BCM2711 SoC, match the compatible string and use the correct set of
options.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index 06bd2b70af3c..e8ad1824c6b3 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -1137,6 +1137,10 @@ static const struct of_device_id bcm2835_pinctrl_match[] = {
 		.compatible = "brcm,bcm2711-gpio",
 		.data = &bcm2711_plat_data,
 	},
+	{
+		.compatible = "brcm,bcm7211-gpio",
+		.data = &bcm2711_pinconf_ops,
+	},
 	{}
 };
 
-- 
2.17.1

Re: [PATCH 3/4] pinctrl: bcm2835: Match BCM7211 compatible string

[Stefan Wahren]

Hi Florian,

Am 28.05.20 um 21:21 schrieb Florian Fainelli:
> The BCM7211 SoC uses the same pinconf_ops as the ones defined for the
> BCM2711 SoC, match the compatible string and use the correct set of
> options.
>
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
> ---
>  drivers/pinctrl/bcm/pinctrl-bcm2835.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> index 06bd2b70af3c..e8ad1824c6b3 100644
> --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
> @@ -1137,6 +1137,10 @@ static const struct of_device_id bcm2835_pinctrl_match[] = {
>  		.compatible = "brcm,bcm2711-gpio",
>  		.data = &bcm2711_plat_data,
>  	},
> +	{
> +		.compatible = "brcm,bcm7211-gpio",
> +		.data = &bcm2711_pinconf_ops,

this doesn't look safe. Maybe bcm2711_plat_data?

Looks like the original patch series based on a older version. Please
double check this still applies since the introduction of 58 GPIO
support for BCM2711.

Regards
Stefan

> +	},
>  	{}
>  };
>  

Re: [PATCH 3/4] pinctrl: bcm2835: Match BCM7211 compatible string

[Florian Fainelli]

On 5/29/2020 6:11 AM, Stefan Wahren wrote:
> Hi Florian,
> 
> Am 28.05.20 um 21:21 schrieb Florian Fainelli:
>> The BCM7211 SoC uses the same pinconf_ops as the ones defined for the
>> BCM2711 SoC, match the compatible string and use the correct set of
>> options.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>> ---
>>  drivers/pinctrl/bcm/pinctrl-bcm2835.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
>> index 06bd2b70af3c..e8ad1824c6b3 100644
>> --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
>> +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
>> @@ -1137,6 +1137,10 @@ static const struct of_device_id bcm2835_pinctrl_match[] = {
>>  		.compatible = "brcm,bcm2711-gpio",
>>  		.data = &bcm2711_plat_data,
>>  	},
>> +	{
>> +		.compatible = "brcm,bcm7211-gpio",
>> +		.data = &bcm2711_pinconf_ops,
> 
> this doesn't look safe. Maybe bcm2711_plat_data?

Whoops you are right, I sent an incorrect version.

> 
> Looks like the original patch series based on a older version. Please
> double check this still applies since the introduction of 58 GPIO
> support for BCM2711.

We can use bcm2711_plat_data, thanks Stefan.
-- 
Florian

[PATCH 4/4] pinctrl: bcm2835: Add support for wake-up interrupts

[Florian Fainelli]

Leverage the IRQCHIP_MASK_ON_SUSPEND flag in order to avoid having to
specifically treat the GPIO interrupts during suspend and resume, and
simply implement an irq_set_wake() callback that is responsible for
enabling the parent wake-up interrupt as a wake-up interrupt.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 58 ++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index e8ad1824c6b3..367fd8e19f92 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -19,6 +19,7 @@
 #include <linux/irq.h>
 #include <linux/irqdesc.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 #include <linux/of_address.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
@@ -76,6 +77,7 @@
 struct bcm2835_pinctrl {
 	struct device *dev;
 	void __iomem *base;
+	int wake_irq[BCM2835_NUM_IRQS];
 
 	/* note: locking assumes each bank will have its own unsigned long */
 	unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
@@ -435,6 +437,11 @@ static void bcm2835_gpio_irq_handler(struct irq_desc *desc)
 	chained_irq_exit(host_chip, desc);
 }
 
+static irqreturn_t bcm2835_gpio_wake_irq_handler(int irq, void *dev_id)
+{
+	return IRQ_HANDLED;
+}
+
 static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
 	unsigned reg, unsigned offset, bool enable)
 {
@@ -634,6 +641,31 @@ static void bcm2835_gpio_irq_ack(struct irq_data *data)
 	bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
 }
 
+static int bcm2835_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
+{
+	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
+	struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+	unsigned gpio = irqd_to_hwirq(data);
+	unsigned int irqgroup;
+	int ret = -EINVAL;
+
+	if (gpio <= 27)
+		irqgroup = 0;
+	else if (gpio >= 28 && gpio <= 45)
+		irqgroup = 1;
+	else if (gpio >= 46 && gpio <= 53)
+		irqgroup = 2;
+	else
+		return ret;
+
+	if (on)
+		ret = enable_irq_wake(pc->wake_irq[irqgroup]);
+	else
+		ret = disable_irq_wake(pc->wake_irq[irqgroup]);
+
+	return ret;
+}
+
 static struct irq_chip bcm2835_gpio_irq_chip = {
 	.name = MODULE_NAME,
 	.irq_enable = bcm2835_gpio_irq_enable,
@@ -642,6 +674,8 @@ static struct irq_chip bcm2835_gpio_irq_chip = {
 	.irq_ack = bcm2835_gpio_irq_ack,
 	.irq_mask = bcm2835_gpio_irq_disable,
 	.irq_unmask = bcm2835_gpio_irq_enable,
+	.irq_set_wake = bcm2835_gpio_irq_set_wake,
+	.flags = IRQCHIP_MASK_ON_SUSPEND,
 };
 
 static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
@@ -1221,8 +1255,30 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
 	 * bank that was firing the IRQ and look up the per-group
 	 * and bank data.
 	 */
-	for (i = 0; i < BCM2835_NUM_IRQS; i++)
+	for (i = 0; i < BCM2835_NUM_IRQS; i++) {
+		int len;
+		char *name;
+
 		girq->parents[i] = irq_of_parse_and_map(np, i);
+		/* Skip over the all banks interrupts */
+		pc->wake_irq[i] = irq_of_parse_and_map(np, i +
+						       BCM2835_NUM_IRQS + 1);
+
+		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);
+
+		/* These are optional interrupts */
+		err = devm_request_irq(dev, pc->wake_irq[i],
+				       bcm2835_gpio_wake_irq_handler,
+				       IRQF_SHARED, name, pc);
+		if (err)
+			dev_warn(dev, "unable to request wake IRQ %d\n",
+				 pc->wake_irq[i]);
+	}
 	girq->default_type = IRQ_TYPE_NONE;
 	girq->handler = handle_level_irq;
 
-- 
2.17.1