linux-kernel - Re: [PATCH] rtc: rtc-s3c: use clk_prepare_enable and clk_disable

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Message-id: <002e01ce366a$4c9f1390$e5dd3ab0$%han@samsung.com>
Date:	Thu, 11 Apr 2013 13:09:01 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Vivek Gautam' <gautam.vivek@...sung.com>,
	'Andrew Morton' <akpm@...uxfoundation.org>
Cc:	'Sylwester Nawrocki' <s.nawrocki@...sung.com>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, a.zummo@...ertech.it,
	kgene.kim@...sung.com, thomas.ab@...sung.com,
	dianders@...omium.org,
	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH] rtc: rtc-s3c: use clk_prepare_enable and
 clk_disable_unprepare

On Wednesday, April 10, 2013 6:50 PM, Sylwester Nawrocki wrote:
> On 04/09/2013 04:27 PM, Vivek Gautam wrote:
> > From: Thomas Abraham <thomas.abraham@...aro.org>
> >
> > Convert clk_enable/clk_disable to clk_prepare_enable/clk_disable_unprepare
> > calls as required by common clock framework.
> >
> > Signed-off-by: Thomas Abraham <thomas.abraham@...aro.org>
> > Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> 
> Thanks Vivek.
> 
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>

CC'ed Andrew Morton

It looks good.
Reviewed-by: Jingoo Han <jg1.han@...sung.com>

> 
> > ---
> >
> > The v1 of this patch is pretty old, but the change needs to be merged to
> > avoid getting those needless WARN_ON() dumps on console.
> >
> > Changes from v1:
> >  - Not using clk_disable_unprepare() at the end of s3c_rtc_probe(), since
> >    this will unprepare the rtc clock which is again getting used in other
> >    funtions later.
> >  - Using clk_unprepare() at the remove() instead to fix things up.
> >
> >  drivers/rtc/rtc-s3c.c |    5 +++--
> >  1 files changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
> > index fb994e9..e3528c9 100644
> > --- a/drivers/rtc/rtc-s3c.c
> > +++ b/drivers/rtc/rtc-s3c.c
> > @@ -430,6 +430,7 @@ static int s3c_rtc_remove(struct platform_device *dev)
> >
> >  	s3c_rtc_setaie(&dev->dev, 0);
> >
> > +	clk_unprepare(rtc_clk);
> >  	rtc_clk = NULL;
> >
> >  	return 0;
> > @@ -498,7 +499,7 @@ static int s3c_rtc_probe(struct platform_device *pdev)
> >  		return ret;
> >  	}
> >
> > -	clk_enable(rtc_clk);
> > +	clk_prepare_enable(rtc_clk);
> >
> >  	/* check to see if everything is setup correctly */
> >
> > @@ -578,7 +579,7 @@ static int s3c_rtc_probe(struct platform_device *pdev)
> >
> >   err_nortc:
> >  	s3c_rtc_enable(pdev, 0);
> > -	clk_disable(rtc_clk);
> > +	clk_disable_unprepare(rtc_clk);
> >
> >  	return ret;
> >  }
> 
> --
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