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

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Date:	Tue, 21 Oct 2014 01:25:07 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Kevin Hilman <khilman@...nel.org>
CC:	"wsa@...-dreams.de" <wsa@...-dreams.de>,
	"Desroches, Ludovic" <Ludovic.Desroches@...el.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 2/3] i2c/at91: add support for system PM

Hi Kevin,

> -----Original Message-----
> From: Kevin Hilman [mailto:khilman@...nel.org]
> Sent: Tuesday, October 21, 2014 2:16 AM
> To: Yang, Wenyou
> Cc: wsa@...-dreams.de; Desroches, Ludovic; linux-i2c@...r.kernel.org; linux-
> kernel@...r.kernel.org; Ferre, Nicolas; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH 2/3] i2c/at91: add support for system PM
> 
> Wenyou Yang <wenyou.yang@...el.com> writes:
> 
> Add a changelog here describing what you're doing, and why.
> 
> > Signed-off-by: Wenyou Yang <wenyou.yang@...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);
> 
> I would just call at91_twi_runtime_suspend() here.
> 
> Then, if you need to add additional steps, you only have to add them in once
> place.  This also makes it obvious that ->suspend and
> ->runtime_suspend are doing the exact same thing.
> 
> NOTE: you'll need to wrap the runtime_suspend|resume functions in just
> CONFIG_PM instead of CONFIG_PM_RUNTIME for this to work.
Thanks a lot, I will modify it.

> 
> Kevin

Best Regards,
Wenyou Yang
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