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From:   Frank Lee <tiny.windzz@gmail.com>
Date:   Sun, 29 Dec 2019 01:39:21 +0800
Message-ID: <CAEExFWvd1Md-guT=wgZ1-G69r71KBn64k2yGh0Vqjh_-D8yGuQ@mail.gmail.com>
Subject: Re: [PATCH] drivers: add devm_platform_ioremap_resource_byname() helper
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Srini Kandagatla <srinivas.kandagatla@linaro.org>,
        vz@mleia.com, khilman@baylibre.com,
        Maxime Ripard <mripard@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>,
        andriy.shevchenko@linux.intel.com,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        mans@mansr.com, treding@nvidia.com, suzuki.poulose@arm.com,
        bgolaszewski@baylibre.com, tglx@linutronix.de
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
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ping...

On Wed, Dec 11, 2019 at 4:31 AM Yangtao Li <tiny.windzz@gmail.com> wrote:
>
> There are currently 300+ instances of using platform_get_resource_byname()
> and devm_ioremap_resource() together in the kernel tree.
>
> This patch wraps these two calls in a single helper.
>
> Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
> ---
>  drivers/base/platform.c         | 22 +++++++++++++++++++++-
>  include/linux/platform_device.h |  3 +++
>  2 files changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index b6c6c7d97d5b..9c4f5e229600 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -60,6 +60,7 @@ struct resource *platform_get_resource(struct platform_device *dev,
>  }
>  EXPORT_SYMBOL_GPL(platform_get_resource);
>
> +#ifdef CONFIG_HAS_IOMEM
>  /**
>   * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
>   *                                 device
> @@ -68,7 +69,7 @@ EXPORT_SYMBOL_GPL(platform_get_resource);
>   *        resource management
>   * @index: resource index
>   */
> -#ifdef CONFIG_HAS_IOMEM
> +
>  void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev,
>                                              unsigned int index)
>  {
> @@ -78,6 +79,25 @@ 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 managemend
> + * @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 */
>
>  static int __platform_get_irq(struct platform_device *dev, unsigned int num)
> diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
> index 1b5cec067533..24ff5da9c532 100644
> --- a/include/linux/platform_device.h
> +++ b/include/linux/platform_device.h
> @@ -63,6 +63,9 @@ extern int platform_irq_count(struct platform_device *);
>  extern struct resource *platform_get_resource_byname(struct platform_device *,
>                                                      unsigned int,
>                                                      const char *);
> +extern void __iomem *
> +devm_platform_ioremap_resource_byname(struct platform_device *pdev,
> +                                     const char *name);
>  extern int platform_get_irq_byname(struct platform_device *, const char *);
>  extern int platform_add_devices(struct platform_device **, int);
>
> --
> 2.17.1
>