linux-kernel - Re: [PATCH 1/3] platform: add common resource requesting and mapping helper

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Date:	Tue, 31 Jan 2012 13:35:31 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Barry Song <Barry.Song@....com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	workgroup.linux@....com, linux-mtd@...ts.infradead.org,
	Barry Song <Baohua.Song@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Erik Gilling <konkers@...gle.com>,
	Atsushi Nemoto <anemo@....ocn.ne.jp>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 1/3] platform: add common resource requesting and mapping
 helper

On Tue, Jan 31, 2012 at 06:00:00PM +0800, Barry Song wrote:
> From: Barry Song <Baohua.Song@....com>
> 
> this patch helps to move the common pattern from
> 
> "
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!res) {
> 	ret = -ENODEV;
> 	goto err;
> }
> 
> base = devm_request_and_ioremap(&dev->dev, mem_res);
> if (!base) {
> 	ret = -ENODEV;
> 	goto err;
> }
> "
> 
> to
> 
> "
> base = platform_devm_request_and_ioremap(pdev, 0);
> if (!base) {
> 	ret = -ENODEV;
> 	goto err;
> }
> "
> 
> Signed-off-by: Barry Song <Baohua.Song@....com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Erik Gilling <konkers@...gle.com>
> Cc: Atsushi Nemoto <anemo@....ocn.ne.jp>
> Cc: David Woodhouse <dwmw2@...radead.org>

Acked-by: Grant Likely <grant.likely@...retlab.ca>

> ---
>  drivers/base/platform.c         |   19 +++++++++++++++++++
>  include/linux/platform_device.h |    1 +
>  2 files changed, 20 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index f0c605e..39ca0ab 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -72,6 +72,25 @@ struct resource *platform_get_resource(struct platform_device *dev,
>  EXPORT_SYMBOL_GPL(platform_get_resource);
>  
>  /**
> + * platform_devm_request_and_ioremap() - get resource, check, request region,
> + * and ioremap resource
> + * @dev: platform device
> + * @num: IOMEM resource index
> + */
> +void __iomem *platform_devm_request_and_ioremap(struct platform_device *dev,
> +	unsigned int num)
> +{
> +	struct resource *res;
> +
> +	res = platform_get_resource(dev, IORESOURCE_MEM, num);
> +	if (!res)
> +		return NULL;
> +
> +	return devm_request_and_ioremap(&dev->dev, res);
> +}
> +EXPORT_SYMBOL_GPL(platform_devm_request_and_ioremap);
> +
> +/**
>   * platform_get_irq - get an IRQ for a device
>   * @dev: platform device
>   * @num: IRQ number index
> diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
> index 60e9994..768c0d7 100644
> --- a/include/linux/platform_device.h
> +++ b/include/linux/platform_device.h
> @@ -44,6 +44,7 @@ extern struct device platform_bus;
>  
>  extern void arch_setup_pdev_archdata(struct platform_device *);
>  extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
> +extern void __iomem *platform_devm_request_and_ioremap(struct platform_device *, unsigned int);
>  extern int platform_get_irq(struct platform_device *, unsigned int);
>  extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, const char *);
>  extern int platform_get_irq_byname(struct platform_device *, const char *);
> -- 
> 1.7.1
> 
> 
> 
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