On Mon, Oct 20, 2014 at 11:42:14AM +0800, Wenyou Yang wrote: > Amend the i2c at91 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 transfer > - "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 <[email protected]>
Acked by: Ludovic Desroches <[email protected]> > --- > drivers/i2c/busses/i2c-at91.c | 12 +++++++++++- > 1 file changed, 11 insertions(+), 1 deletion(-) > > diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c > index 8f408f8..ed2c382 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 */ > @@ -748,6 +749,8 @@ static int at91_twi_probe(struct platform_device *pdev) > u32 phy_addr; > u32 bus_clk_rate; > > + pinctrl_pm_select_default_state(&pdev->dev); > + > dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL); > if (!dev) > return -ENOMEM; > @@ -850,8 +853,10 @@ static int at91_twi_suspend(struct device *dev) > { > struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); > > - if (!pm_runtime_suspended(dev)) > + if (!pm_runtime_suspended(dev)) { > clk_disable_unprepare(twi_dev->clk); > + pinctrl_pm_select_sleep_state(dev); > + } > > return 0; > } > @@ -862,6 +867,7 @@ static int at91_twi_resume(struct device *dev) > int ret; > > if (!pm_runtime_suspended(dev)) { > + pinctrl_pm_select_default_state(dev); > ret = clk_prepare_enable(twi_dev->clk); > if (ret) > return ret; > @@ -881,6 +887,8 @@ static int at91_twi_runtime_suspend(struct device *dev) > > clk_disable_unprepare(twi_dev->clk); > > + pinctrl_pm_select_sleep_state(dev); > + > return 0; > } > > @@ -888,6 +896,8 @@ 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); > } > #endif > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
