[PATCH 2/3] i2c/at91: add support for system PM

[Ludovic Desroches]

Adding Kevin in the CC list since he had some comments about the PM
runtime support for the SPI driver.

On Mon, Oct 20, 2014 at 02:42:42PM +0200, Ludovic Desroches wrote:
> On Mon, Oct 20, 2014 at 11:42:13AM +0800, Wenyou Yang wrote:
> > Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
> 
> Acked by: Ludovic Desroches <ludovic.desroches at atmel.com>
> 
> > ---
> >  drivers/i2c/busses/i2c-at91.c |   30 ++++++++++++++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> > 
> > diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
> > index 03b9f48..8f408f8 100644
> > --- a/drivers/i2c/busses/i2c-at91.c
> > +++ b/drivers/i2c/busses/i2c-at91.c
> > @@ -845,6 +845,35 @@ static int at91_twi_remove(struct platform_device *pdev)
> >  }
> >  
> >  #ifdef CONFIG_PM
> > +#ifdef CONFIG_PM_SLEEP
> > +static int at91_twi_suspend(struct device *dev)
> > +{
> > +	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
> > +
> > +	if (!pm_runtime_suspended(dev))
> > +		clk_disable_unprepare(twi_dev->clk);
> > +
> > +	return 0;
> > +}
> > +
> > +static int at91_twi_resume(struct device *dev)
> > +{
> > +	struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
> > +	int ret;
> > +
> > +	if (!pm_runtime_suspended(dev)) {
> > +		ret = clk_prepare_enable(twi_dev->clk);
> > +		if (ret)
> > +			return ret;
> > +	}
> > +
> > +	pm_runtime_mark_last_busy(dev);
> > +	pm_request_autosuspend(dev);
> > +
> > +	return 0;
> > +}
> > +#endif
> > +
> >  #ifdef CONFIG_PM_RUNTIME
> >  static int at91_twi_runtime_suspend(struct device *dev)
> >  {
> > @@ -864,6 +893,7 @@ static int at91_twi_runtime_resume(struct device *dev)
> >  #endif
> >  
> >  static const struct dev_pm_ops at91_twi_pm = {
> > +	SET_SYSTEM_SLEEP_PM_OPS(at91_twi_suspend, at91_twi_resume)
> >  	SET_RUNTIME_PM_OPS(at91_twi_runtime_suspend,
> >  				at91_twi_runtime_resume, NULL)
> >  };
> > -- 
> > 1.7.9.5
> >