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SubjectRe: [PATCH v2 1/4] drivers: provide devm_platform_ioremap_and_get_resource()
Hi Dejin,

On Sat, Mar 14, 2020 at 6:26 AM Dejin Zheng <zhengdejin5@gmail.com> wrote:
> Since commit "drivers: provide devm_platform_ioremap_resource()",
> It was wrap platform_get_resource() and devm_ioremap_resource() as
> single helper devm_platform_ioremap_resource(). but now, many drivers
> still used platform_get_resource() and devm_ioremap_resource()
> together in the kernel tree. The reason can not be replaced is they
> still need use the resource variables obtained by platform_get_resource().
> so provide this helper.
>
> Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>

Thanks for your patch!

> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -62,6 +62,24 @@ struct resource *platform_get_resource(struct platform_device *dev,
> EXPORT_SYMBOL_GPL(platform_get_resource);
>
> #ifdef CONFIG_HAS_IOMEM
> +/**
> + * devm_platform_ioremap_and_get_resource - call devm_ioremap_resource() for a
> + * platform device and get resource
> + *
> + * @pdev: platform device to use both for memory resource lookup as well as
> + * resource management
> + * @index: resource index
> + * @res: get the resource
> + */
> +void __iomem *
> +devm_platform_ioremap_and_get_resource(struct platform_device *pdev,
> + unsigned int index, struct resource **res)
> +{
> + *res = platform_get_resource(pdev, IORESOURCE_MEM, index);
> + return devm_ioremap_resource(&pdev->dev, *res);
> +}
> +EXPORT_SYMBOL_GPL(devm_platform_ioremap_and_get_resource);

As this duplicates most of the implementation of
devm_platform_ioremap_resource(),
I think it would be better to make res optional:

void __iomem *
devm_platform_ioremap_and_get_resource(struct platform_device *pdev,
unsigned int index, struct
resource **resp)
{
struct resource **res;

res = platform_get_resource(pdev, IORESOURCE_MEM, index);
if (resp)
*resp = res;
return devm_ioremap_resource(&pdev->dev, *res);
}

And implement devm_platform_ioremap_resource() by calling
devm_platform_ioremap_and_get_resource() with resp = NULL.
Whether the best way to do that is as an exported functions, or as an
inlined function, is to be seen (measure impact on kernel size).

> +
> /**
> * 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 276a03c24691..5fd1977e3eaf 100644
> --- a/include/linux/platform_device.h
> +++ b/include/linux/platform_device.h
> @@ -55,6 +55,9 @@ extern struct device *
> platform_find_device_by_driver(struct device *start,
> const struct device_driver *drv);
> extern void __iomem *
> +devm_platform_ioremap_and_get_resource(struct platform_device *pdev,
> + unsigned int index, struct resource **res);
> +extern void __iomem *
> devm_platform_ioremap_resource(struct platform_device *pdev,
> unsigned int index);
> extern void __iomem *

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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