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

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Date:	Tue, 23 Apr 2013 02:10:25 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	Jingoo Han <jg1.han@...sung.com>
CC:	'Vivek Gautam' <gautam.vivek@...sung.com>,
	'Andrew Morton' <akpm@...uxfoundation.org>,
	'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>
Subject: Re: [PATCH] rtc: rtc-s3c: use clk_prepare_enable and clk_disable_unprepare

On 04/11/13 13:09, Jingoo Han wrote:
> 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>

Acked-by: Kukjin Kim <kgene.kim@...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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