linux-kernel - Re: [PATCH 2/2] driver core: platform: provide devm_platform_iounremap

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Date:   Tue, 29 Sep 2020 14:21:37 +0800
From:   pierre kuo <vichy.kuo@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>, rafael@...nel.org
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] driver core: platform: provide devm_platform_iounremap_resource

Hi Greg and Rafael:
Would you please help to review these 2 patches?

https://lkml.org/lkml/2020/9/20/112
https://lkml.org/lkml/2020/9/20/113

Appreciate ur help in advance.

>
> Combine platform_get_resource() and devm_iounremap_resource() to release
> the iomem allocated by devm_platform_get_and_ioremap_resource().
>
> Signed-off-by: pierre Kuo <vichy.kuo@...il.com>
> ---
>  drivers/base/platform.c         | 24 ++++++++++++++++++++++++
>  include/linux/platform_device.h |  4 ++++
>  2 files changed, 28 insertions(+)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index e5d8a0503b4f..e2655c00873f 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -84,6 +84,30 @@ devm_platform_get_and_ioremap_resource(struct platform_device *pdev,
>  }
>  EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource);
>
> +/**
> + * devm_platform_iounremap_resource - call devm_iounremap_resource() for a
> + *                                   platform device with memory that addr points to.
> + *
> + * @pdev: platform device to use both for memory resource lookup as well as
> + *        resource management
> + * @index: resource index
> + * @addr: address to be unmap.
> + */
> +void
> +devm_platform_iounremap_resource(struct platform_device *pdev,
> +                                unsigned int index, void __iomem *addr)
> +{
> +       struct resource *r;
> +
> +       r = platform_get_resource(pdev, IORESOURCE_MEM, index);
> +       if (!r)
> +               dev_err(&pdev->dev,
> +                       "MEM resource index %d not found\n", index);
> +       else
> +               devm_iounremap_resource(&pdev->dev, r, addr);
> +}
> +EXPORT_SYMBOL_GPL(devm_platform_iounremap_resource);
> +
>  /**
>   * devm_platform_ioremap_resource - call devm_ioremap_resource() for a platform
>   *                                 device
> diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
> index 77a2aada106d..75da15937679 100644
> --- a/include/linux/platform_device.h
> +++ b/include/linux/platform_device.h
> @@ -67,6 +67,10 @@ devm_platform_ioremap_resource_wc(struct platform_device *pdev,
>  extern void __iomem *
>  devm_platform_ioremap_resource_byname(struct platform_device *pdev,
>                                       const char *name);
> +extern void
> +devm_platform_iounremap_resource(struct platform_device *pdev,
> +                                unsigned int index,
> +                                void __iomem *addr);
>  extern int platform_get_irq(struct platform_device *, unsigned int);
>  extern int platform_get_irq_optional(struct platform_device *, unsigned int);
>  extern int platform_irq_count(struct platform_device *);
> --
> 2.17.1
>