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spi: atmel: adopt pinctrl support

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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@atmel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Wenyou Yang 2014-03-05 09:58:49 +08:00 committed by Mark Brown
parent ad6f33d22c
commit 5bdfd491a0
1 changed files with 9 additions and 0 deletions
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9
drivers/spi/spi-atmel.c
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@ -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;
}