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i2c: at91: adopt pinctrl support

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Amend the at91 i2c pin controller to set the state of the pins to:
- "default" on resume.
- "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: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wenyou Yang 2014-11-10 09:55:52 +08:00 committed by Wolfram Sang
parent ab0831d0f3
commit 62d10c402f
1 changed files with 5 additions and 0 deletions
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5
drivers/i2c/busses/i2c-at91.c
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@ -32,6 +32,7 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/platform_data/dma-atmel.h> #include <linux/platform_data/dma-atmel.h>
#include <linux/pm_runtime.h> #include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */ #define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */
#define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */ #define AT91_I2C_TIMEOUT msecs_to_jiffies(100) /* transfer timeout */
@ -851,6 +852,8 @@ static int at91_twi_runtime_suspend(struct device *dev)
clk_disable_unprepare(twi_dev->clk); clk_disable_unprepare(twi_dev->clk);
pinctrl_pm_select_sleep_state(dev);
return 0; return 0;
} }
@ -858,6 +861,8 @@ static int at91_twi_runtime_resume(struct device *dev)
{ {
struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
pinctrl_pm_select_default_state(dev);
return clk_prepare_enable(twi_dev->clk); return clk_prepare_enable(twi_dev->clk);
} }