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authorWenyou Yang <wenyou.yang@atmel.com>2014-11-10 09:55:52 +0800
committerWolfram Sang <wsa@the-dreams.de>2014-11-12 16:50:24 +0100
commit62d10c402f085be2bfa51b39199a76249ec09396 (patch)
treeb2b60c8e6894473738a37857499922d88f144cbe /drivers/i2c
parentab0831d0f35b44724390134d03bcff99ae0d8a7e (diff)
downloadblackbird-op-linux-62d10c402f085be2bfa51b39199a76249ec09396.tar.gz
blackbird-op-linux-62d10c402f085be2bfa51b39199a76249ec09396.zip
i2c: at91: adopt pinctrl support
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-at91.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 7c335f41dc3d..77fb6472fd5d 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -32,6 +32,7 @@
#include <linux/slab.h>
#include <linux/platform_data/dma-atmel.h>
#include <linux/pm_runtime.h>
+#include <linux/pinctrl/consumer.h>
#define DEFAULT_TWI_CLK_HZ 100000 /* max 400 Kbits/s */
#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);
+ pinctrl_pm_select_sleep_state(dev);
+
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);
+ pinctrl_pm_select_default_state(dev);
+
return clk_prepare_enable(twi_dev->clk);
}
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