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>

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);
 }