linux-kernel - Re: [PATCH 2/3] i2c/at91: add support for system PM

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Message-ID: <20141020131514.GG7443@ldesroches-Latitude-E6320>
Date:	Mon, 20 Oct 2014 15:15:14 +0200
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Wenyou Yang <wenyou.yang@...el.com>, <wsa@...-dreams.de>,
	<linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nicolas.ferre@...el.com>, <linux-arm-kernel@...ts.infradead.org>
CC:	<khilman@...nel.org>
Subject: Re: [PATCH 2/3] i2c/at91: add support for system PM

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@...el.com>
> 
> Acked by: Ludovic Desroches <ludovic.desroches@...el.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
> > 
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