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 00:42:38 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Ivan Khoronzhuk <ivan.khoronzhuk@...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 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
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