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Commit 5bdfd491 authored by Wenyou Yang's avatar Wenyou Yang Committed by Mark Brown
Browse files

spi: atmel: adopt pinctrl support 



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: default avatarWenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent ad6f33d2

drivers/spi/spi-atmel.c

+9 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 


#include <linux/io.h>

#include <linux/gpio.h>

#include <linux/pinctrl/consumer.h>



/* SPI register offsets */

#define SPI_CR					0x0000
@@ -1292,6 +1293,9 @@ 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;
@@ -1446,6 +1450,9 @@ 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;

}
@@ -1454,6 +1461,8 @@ 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;

}