[PATCHv3 1/2] gpio: xilinx: dt-binding: Add clock node

[PATCHv3 1/2] gpio: xilinx: dt-binding: Add clock node

[Shubhrajyoti Datta]

Add the clock node to the dt binding.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
---
v2: 
Make clocks optional
Add clock name
v3:
No change

 .../devicetree/bindings/gpio/gpio-xilinx.txt       |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt b/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
index 63bf4be..1372007 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
@@ -25,12 +25,16 @@ Optional properties:
 - xlnx,dout-default-2 : as above but the second channel
 - xlnx,gpio2-width : as above but for the second channel
 - xlnx,tri-default-2 : as above but for the second channel
+- clocks: Input clock specifier. Refer to common clock bindings.
+- clock-names: Input clock name, should be s_axi_aclk.
 
 
 Example:
 gpio: gpio@40000000 {
 	#gpio-cells = <2>;
 	compatible = "xlnx,xps-gpio-1.00.a";
+	clocks = <&clkc 15>;
+	clock-names = "s_axi_aclk";
 	gpio-controller ;
 	interrupt-parent = <&microblaze_0_intc>;
 	interrupts = < 6 2 >;
-- 
1.7.1

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[PATCHv3 2/2] gpio: xilinx: Add clock support

[Shubhrajyoti Datta]

Add basic clock support for xilinx gpio.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
---
v2 :
no change
v3:
Add clock name
Remove some debug messages

 drivers/gpio/gpio-xilinx.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 14b2a62..3385a0a 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -13,6 +13,7 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/clk.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/module.h>
@@ -45,6 +46,7 @@
  * @gpio_state: GPIO state shadow register
  * @gpio_dir: GPIO direction shadow register
  * @gpio_lock: Lock used for synchronization
+ * @clk: Clock resource for this controller
  */
 struct xgpio_instance {
 	struct of_mm_gpio_chip mmchip;
@@ -52,6 +54,7 @@ struct xgpio_instance {
 	u32 gpio_state[2];
 	u32 gpio_dir[2];
 	spinlock_t gpio_lock[2];
+	struct clk *clk;
 };
 
 static inline int xgpio_index(struct xgpio_instance *chip, int gpio)
@@ -282,6 +285,7 @@ static int xgpio_remove(struct platform_device *pdev)
 	struct xgpio_instance *chip = platform_get_drvdata(pdev);
 
 	of_mm_gpiochip_remove(&chip->mmchip);
+	clk_disable_unprepare(chip->clk);
 
 	return 0;
 }
@@ -307,6 +311,21 @@ static int xgpio_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, chip);
 
+	/* Retrieve GPIO clock */
+	chip->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
+	if (IS_ERR(chip->clk)) {
+		if (PTR_ERR(chip->clk) == -ENOENT)
+			chip->clk = NULL;
+		else
+			return PTR_ERR(chip->clk);
+	}
+
+	status = clk_prepare_enable(chip->clk);
+	if (status) {
+		dev_err(&pdev->dev, "Unable to enable clock.\n");
+		return status;
+	}
+
 	/* Update GPIO state shadow register with default value */
 	of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state[0]);
 
@@ -362,6 +381,7 @@ static int xgpio_probe(struct platform_device *pdev)
 	if (status) {
 		pr_err("%s: error in probe function with status %d\n",
 		       np->full_name, status);
+		clk_disable_unprepare(chip->clk);
 		return status;
 	}
 
-- 
1.7.1

Re: [PATCHv3 1/2] gpio: xilinx: dt-binding: Add clock node

[Sören Brinkmann]

On Thu, 2016-11-10 at 11:26:04 +0530, Shubhrajyoti Datta wrote:
> Add the clock node to the dt binding.
> 
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
> ---
> v2: 
> Make clocks optional
> Add clock name
> v3:
> No change
> 
>  .../devicetree/bindings/gpio/gpio-xilinx.txt       |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt b/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
> index 63bf4be..1372007 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
> +++ b/Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
> @@ -25,12 +25,16 @@ Optional properties:
>  - xlnx,dout-default-2 : as above but the second channel
>  - xlnx,gpio2-width : as above but for the second channel
>  - xlnx,tri-default-2 : as above but for the second channel
> +- clocks: Input clock specifier. Refer to common clock bindings.
> +- clock-names: Input clock name, should be s_axi_aclk.

I don't know if there is a good way to tell that 'clock-names' is
required when 'clocks' is specified. Probably just nice to have.
Acked-by: Sören Brinkmann <soren.brinkmann-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>

	Sören
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Re: [PATCHv3 2/2] gpio: xilinx: Add clock support

[Sören Brinkmann]

On Thu, 2016-11-10 at 11:26:05 +0530, Shubhrajyoti Datta wrote:
> Add basic clock support for xilinx gpio.
> 
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
> ---
> v2 :
> no change
> v3:
> Add clock name
> Remove some debug messages
> 
>  drivers/gpio/gpio-xilinx.c |   20 ++++++++++++++++++++
>  1 files changed, 20 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
> index 14b2a62..3385a0a 100644
> --- a/drivers/gpio/gpio-xilinx.c
> +++ b/drivers/gpio/gpio-xilinx.c
> @@ -13,6 +13,7 @@
>   */
>  
>  #include <linux/bitops.h>
> +#include <linux/clk.h>
>  #include <linux/init.h>
>  #include <linux/errno.h>
>  #include <linux/module.h>
> @@ -45,6 +46,7 @@
>   * @gpio_state: GPIO state shadow register
>   * @gpio_dir: GPIO direction shadow register
>   * @gpio_lock: Lock used for synchronization
> + * @clk: Clock resource for this controller
>   */
>  struct xgpio_instance {
>  	struct of_mm_gpio_chip mmchip;
> @@ -52,6 +54,7 @@ struct xgpio_instance {
>  	u32 gpio_state[2];
>  	u32 gpio_dir[2];
>  	spinlock_t gpio_lock[2];
> +	struct clk *clk;
>  };
>  
>  static inline int xgpio_index(struct xgpio_instance *chip, int gpio)
> @@ -282,6 +285,7 @@ static int xgpio_remove(struct platform_device *pdev)
>  	struct xgpio_instance *chip = platform_get_drvdata(pdev);
>  
>  	of_mm_gpiochip_remove(&chip->mmchip);
> +	clk_disable_unprepare(chip->clk);
>  
>  	return 0;
>  }
> @@ -307,6 +311,21 @@ static int xgpio_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, chip);
>  
> +	/* Retrieve GPIO clock */
> +	chip->clk = devm_clk_get(&pdev->dev, "s_axi_aclk");
> +	if (IS_ERR(chip->clk)) {
> +		if (PTR_ERR(chip->clk) == -ENOENT)
> +			chip->clk = NULL;
> +		else
> +			return PTR_ERR(chip->clk);

I personally would have kept the error message to give users a hint
why/what failed.
Acked-by: Sören Brinkmann <soren.brinkmann-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>

	Sören
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Re: [PATCHv3 1/2] gpio: xilinx: dt-binding: Add clock node

[Rob Herring]

On Thu, Nov 10, 2016 at 11:26:04AM +0530, Shubhrajyoti Datta wrote:
> Add the clock node to the dt binding.
> 
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
> ---
> v2: 
> Make clocks optional
> Add clock name
> v3:
> No change
> 
>  .../devicetree/bindings/gpio/gpio-xilinx.txt       |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)

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

Re: [PATCHv3 2/2] gpio: xilinx: Add clock support

[Shubhrajyoti Datta]

On Thu, Nov 10, 2016 at 11:26 AM, Shubhrajyoti Datta
<shubhrajyoti.datta@xilinx.com> wrote:
> Add basic clock support for xilinx gpio.
>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Ping