linux-kernel - Re: [PATCH] drivers: Provide devm_platform_ioremap_resource

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Message-ID: <20190614133840.GN9224@smile.fi.intel.com>
Date:   Fri, 14 Jun 2019 16:38:40 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Markus Elfring <Markus.Elfring@....de>,
        Jack Ping CHNG <jack.ping.chng@...ux.intel.com>
Cc:     kernel-janitors@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Enrico Weigelt <lkml@...ux.net>,
        Himanshu Jha <himanshujha199640@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] drivers: Provide devm_platform_ioremap_resource_byname()

+Cc: Jack Ping, who did internally the same

On Fri, Jun 14, 2019 at 03:26:25PM +0200, Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Fri, 14 Jun 2019 15:15:14 +0200
> 
> The functions “platform_get_resource_byname” and “devm_ioremap_resource”
> are called together in 181 source files.
> This implementation detail can be determined also with the help
> of the semantic patch language (Coccinelle software).
> 
> Wrap these two calls into another helper function.
> Thus a local variable does not need to be declared for a resource
> structure pointer before and a redundant argument can be omitted
> for the resource type.

This one makes sense.
Though I'm not sure Greg will see your message.

Rafael, maybe you can apply this one?

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/base/platform.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 4d1729853d1a..c1f19a479dd7 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -97,6 +97,24 @@ void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
>  	return devm_ioremap_resource(&pdev->dev, res);
>  }
>  EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource);
> +
> +/**
> + * devm_platform_ioremap_resource_byname
> + * Call devm_ioremap_resource() for a platform device
> + *
> + * @pdev: platform device to use both for memory resource lookup as well as
> + *        resource management
> + * @name: resource name
> + */
> +void __iomem *devm_platform_ioremap_resource_byname(struct platform_device *pdev,
> +						    const char *name)
> +{
> +	struct resource *res;
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
> +	return devm_ioremap_resource(&pdev->dev, res);
> +}
> +EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource_byname);
>  #endif /* CONFIG_HAS_IOMEM */
> 
>  /**
> --
> 2.22.0
> 

-- 
With Best Regards,
Andy Shevchenko