linux-kernel - Re: [PATCH v3 9/9] mtd: nand: davinci: don't request AEMIF address range

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Date:	Tue, 17 Dec 2013 12:33:28 +0200
From:	"ivan.khoronzhuk" <ivan.khoronzhuk@...com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	Santosh Shilimkar <santosh.shilimkar@...com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	<devicetree@...r.kernel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <rob.herring@...xeda.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mtd@...ts.infradead.org>, <grygorii.strashko@...com>,
	<dwmw2@...radead.org>
Subject: Re: [PATCH v3 9/9] mtd: nand: davinci: don't request AEMIF address
 range

On 12/17/2013 10:42 AM, Brian Norris wrote:
> On Thu, Dec 05, 2013 at 07:25:57PM +0200, Ivan Khoronzhuk wrote:
>> The TI AEMIF driver registers are used to setup timings for each chip
>> select. The same registers range is used to setup NAND settings.
>> The AEMIF and NAND drivers not use the same registers in this range.
>>
>> In case with TI AEMIF driver, the memory address range is requested
>> already by AEMIF, so we cannot request it twice, just ioremap.
>>
>> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
>> Reviewed-by: Grygorii Strashko <grygorii.strashko@...com>
>> Reviewed-by: Taras Kondratiuk <taras@...com>
>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...com>
>> ---
>>   drivers/mtd/nand/davinci_nand.c |    8 +++++---
>>   1 file changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
>> index f7b21b8..0cd4dbc 100644
>> --- a/drivers/mtd/nand/davinci_nand.c
>> +++ b/drivers/mtd/nand/davinci_nand.c
>> @@ -636,9 +636,11 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
>>   	if (IS_ERR(vaddr))
>>   		return PTR_ERR(vaddr);
>>
>> -	base = devm_ioremap_resource(&pdev->dev, res2);
>> -	if (IS_ERR(base))
>> -		return PTR_ERR(base);
>> +	base = devm_ioremap(&pdev->dev, res2->start, resource_size(res2));
>
> Since it's important that we don't re-introduce the "request resource"
> boilerplate later, can you add a comment describing the situation?
>
>> +	if (!base) {
>> +		dev_err(&pdev->dev, "ioremap failed for resource %pR\n", res2);
>> +		return -EADDRNOTAVAIL;
>> +	}
>>
>>   	info->dev		= &pdev->dev;
>>   	info->base		= base;
>
> Thanks,
> Brian
>

Yes, I'll add the comment.

-- 
Regards,
Ivan Khoronzhuk
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