From mboxrd@z Thu Jan 1 00:00:00 1970 From: wenyou.yang@atmel.com (Wenyou Yang) Date: Mon, 10 Nov 2014 09:55:52 +0800 Subject: [PATCH v4] i2c/at91: adopt pinctrl support Message-ID: <1415584552-11390-1-git-send-email-wenyou.yang@atmel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Amend the at91 i2c pin controller to optionally take a pin control handle and set the state of the pins to: - "default" on boot and 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 --- Hi Wolfram, Thanks a lot. The change of this version is to remove pinctrl_pm_select_default_state(&pdev->dev) from the _probe function. Best Regards, Wenyou Yang drivers/i2c/busses/i2c-at91.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index 7c335f4..77fb647 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -32,6 +32,7 @@ #include #include #include +#include #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); } -- 1.7.9.5