[PATCH 0/2] spi: atmel: adopt pinctrl support

[PATCH 0/2] spi: atmel: adopt pinctrl support

[Wenyou Yang]

Hi Mark, 

This patch is to adopt pinctrl support to optimize energy usage for the pins
both for the suspend/resume cycle.

The patch is based on the branch: for-next
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git

Best Regards,
Wenyou Yang

Wenyou Yang (2):
  spi: atmel: adopt pinctrl support
  ARM: dts: sama5d36ek: add spi pinctrl sleep state

 arch/arm/boot/dts/sama5d36ek.dts |   14 ++++++++++++++
 drivers/spi/spi-atmel.c          |    9 +++++++++
 2 files changed, 23 insertions(+)

-- 
1.7.9.5

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[PATCH 1/2] spi: atmel: adopt pinctrl support

[Wenyou Yang]

Amend the spi atmel pin controller to optionally take a pin control
handle and set the state of the pins to:

- "default" on boot, resume and before performing an spitransfer
- "sleep" on suspend()

This should make it possible to optimize energy usage for the pins
both for the suspend/resume cycle

Signed-off-by: Wenyou Yang <wenyou.yang-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-atmel.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index b0842f7..54b4436 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -26,6 +26,7 @@
 
 #include <linux/io.h>
 #include <linux/gpio.h>
+#include <linux/pinctrl/consumer.h>
 
 /* SPI register offsets */
 #define SPI_CR					0x0000
@@ -1303,6 +1304,9 @@ static int atmel_spi_probe(struct platform_device *pdev)
 	struct spi_master	*master;
 	struct atmel_spi	*as;
 
+	/* Select default pin state */
+	pinctrl_pm_select_default_state(&pdev->dev);
+
 	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!regs)
 		return -ENXIO;
@@ -1457,6 +1461,9 @@ static int atmel_spi_suspend(struct device *dev)
 	struct atmel_spi	*as = spi_master_get_devdata(master);
 
 	clk_disable_unprepare(as->clk);
+
+	pinctrl_pm_select_sleep_state(dev);
+
 	return 0;
 }
 
@@ -1465,6 +1472,8 @@ static int atmel_spi_resume(struct device *dev)
 	struct spi_master	*master = dev_get_drvdata(dev);
 	struct atmel_spi	*as = spi_master_get_devdata(master);
 
+	pinctrl_pm_select_default_state(dev);
+
 	clk_prepare_enable(as->clk);
 	return 0;
 }
-- 
1.7.9.5

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Re: [PATCH 1/2] spi: atmel: adopt pinctrl support

[Mark Brown]

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On Wed, Mar 05, 2014 at 09:58:49AM +0800, Wenyou Yang wrote:
> Amend the spi atmel pin controller to optionally take a pin control
> handle and set the state of the pins to:

Applied, thanks.

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[PATCH 2/2] ARM: dts: sama5d36ek: add spi pinctrl sleep state

[Wenyou Yang]

Signed-off-by: Wenyou Yang <wenyou.yang-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
---
 arch/arm/boot/dts/sama5d36ek.dts |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/sama5d36ek.dts b/arch/arm/boot/dts/sama5d36ek.dts
index 59576c6..676d121 100644
--- a/arch/arm/boot/dts/sama5d36ek.dts
+++ b/arch/arm/boot/dts/sama5d36ek.dts
@@ -18,6 +18,8 @@
 	ahb {
 		apb {
 			spi0: spi@f0004000 {
+				pinctrl-names = "default", "sleep";
+				pinctrl-1 = <&pinctrl_spi0_sleep>;
 				status = "okay";
 			};
 
@@ -44,6 +46,18 @@
 			macb1: ethernet@f802c000 {
 				status = "okay";
 			};
+
+			pinctrl@fffff200 {
+				spi0 {
+					pinctrl_spi0_sleep: spi0-1 {
+						atmel,pins =
+							<AT91_PIOD 10 AT91_PERIPH_GPIO AT91_PINCTRL_OUTPUT_LOW	/* PD10 GPIO Output Low */
+							 AT91_PIOD 11 AT91_PERIPH_GPIO AT91_PINCTRL_OUTPUT_LOW	/* PD11 GPIO Output Low */
+							 AT91_PIOD 12 AT91_PERIPH_GPIO AT91_PINCTRL_OUTPUT_LOW>;	/* PD12 GPIO Output Low */
+					};
+				};
+
+			};
 		};
 	};
 
-- 
1.7.9.5

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Re: [PATCH 2/2] ARM: dts: sama5d36ek: add spi pinctrl sleep state

[Alexandre Belloni]

Hi,

On 05/03/2014 at 09:58:50 +0800, Wenyou Yang wrote :
> Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
> ---
>  arch/arm/boot/dts/sama5d36ek.dts |   14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sama5d36ek.dts b/arch/arm/boot/dts/sama5d36ek.dts
> index 59576c6..676d121 100644
> --- a/arch/arm/boot/dts/sama5d36ek.dts
> +++ b/arch/arm/boot/dts/sama5d36ek.dts
> @@ -18,6 +18,8 @@
>  	ahb {
>  		apb {
>  			spi0: spi@f0004000 {
> +				pinctrl-names = "default", "sleep";
> +				pinctrl-1 = <&pinctrl_spi0_sleep>;
>  				status = "okay";
>  			};
>  
> @@ -44,6 +46,18 @@
>  			macb1: ethernet@f802c000 {
>  				status = "okay";
>  			};
> +
> +			pinctrl@fffff200 {
> +				spi0 {
> +					pinctrl_spi0_sleep: spi0-1 {
> +						atmel,pins =
> +							<AT91_PIOD 10 AT91_PERIPH_GPIO AT91_PINCTRL_OUTPUT_LOW	/* PD10 GPIO Output Low */
> +							 AT91_PIOD 11 AT91_PERIPH_GPIO AT91_PINCTRL_OUTPUT_LOW	/* PD11 GPIO Output Low */
> +							 AT91_PIOD 12 AT91_PERIPH_GPIO AT91_PINCTRL_OUTPUT_LOW>;	/* PD12 GPIO Output Low */

I think that one would belong to the dtsi as this is generic enough.

Also, it was suggested by Mark that list entries should be bracketed
separately. But I guess we may not want to mix styles in the same file.
Nicolas, what do you think ?


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com