linux-kernel - [REMINDER: PATCH 1/1] mtd:nand:clk: preparation for switch to common clock framework

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Date:	Fri, 28 Sep 2012 16:10:32 +0000
From:	"Karicheri, Muralidharan" <m-karicheri2@...com>
To:	"Karicheri, Muralidharan" <m-karicheri2@...com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"artem.bityutskiy@...ux.intel.com" <artem.bityutskiy@...ux.intel.com>,
	"hs@...x.de" <hs@...x.de>,
	"mikedunn@...sguy.com" <mikedunn@...sguy.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: [REMINDER: PATCH 1/1] mtd:nand:clk: preparation for switch to
 common clock framework

>> -----Original Message-----
>> From: Karicheri, Muralidharan
>> Sent: Monday, September 17, 2012 12:38 PM
>> To: dwmw2@...radead.org; artem.bityutskiy@...ux.intel.com; hs@...x.de;
>> mikedunn@...sguy.com; linux-mtd@...ts.infradead.org; linux-kernel@...r.kernel.org;
>> davinci-linux-open-source@...ux.davincidsp.com; linux-arm-kernel@...ts.infradead.org
>> Cc: Karicheri, Muralidharan
>> Subject: [PATCH 1/1] mtd:nand:clk: preparation for switch to common clock framework
>> 
>> As a first step towards migrating davinci platforms to use common clock
>> framework, replace all instances of clk_enable() with clk_prepare_enable()
>> and clk_disable() with clk_disable_unprepare(). Until the platform is
>> switched to use the CONFIG_HAVE_CLK_PREPARE Kconfig variable, this just
>> adds a might_sleep() call and would work without any issues.
>> 
>> This will make it easy later to switch to common clk based implementation
>> of clk driver from DaVinci specific driver.
>> 
>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>> Reviewed-by: Mike Turquette <mturquette@...aro.org>
>> 
>> diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
>> index f386b3c..df1ab7d 100644
>> --- a/drivers/mtd/nand/davinci_nand.c
>> +++ b/drivers/mtd/nand/davinci_nand.c
>> @@ -724,7 +724,7 @@ static int __init nand_davinci_probe(struct platform_device
>> *pdev)
>>  		goto err_clk;
>>  	}
>> 
>> -	ret = clk_enable(info->clk);
>> +	ret = clk_prepare_enable(info->clk);
>>  	if (ret < 0) {
>>  		dev_dbg(&pdev->dev, "unable to enable AEMIF clock, err %d\n",
>>  			ret);
>> @@ -835,7 +835,7 @@ syndrome_done:
>> 
>>  err_scan:
>>  err_timing:
>> -	clk_disable(info->clk);
>> +	clk_disable_unprepare(info->clk);
>> 
>>  err_clk_enable:
>>  	clk_put(info->clk);
>> @@ -872,7 +872,7 @@ static int __exit nand_davinci_remove(struct platform_device
>> *pdev)
>> 
>>  	nand_release(&info->mtd);
>> 
>> -	clk_disable(info->clk);
>> +	clk_disable_unprepare(info->clk);
>>  	clk_put(info->clk);
>> 
>>  	kfree(info);
>> --
>> 1.7.9.5

Could you please review and apply this patch to mtd subsystem tree for linux-next?

Murali Karicheri
Software Design Engineer


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