linux-kernel - Re: [PATCH v1 1/5] driver core: platform: Introduce platform_get_mem_or_io

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Date:   Thu, 3 Dec 2020 14:21:40 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Eric Auger <eric.auger@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        kvm@...r.kernel.org, linux-usb@...r.kernel.org,
        Peng Hao <peng.hao2@....com.cn>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v1 1/5] driver core: platform: Introduce
 platform_get_mem_or_io_resource()

On Tue, 27 Oct 2020 19:58:02 +0200
Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

> There are at least few existing users of the proposed API which
> retrieves either MEM or IO resource from platform device.
> 
> Make it common to utilize in the existing and new users.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Eric Auger <eric.auger@...hat.com>
> Cc: Alex Williamson <alex.williamson@...hat.com>
> Cc: Cornelia Huck <cohuck@...hat.com>
> Cc: kvm@...r.kernel.org
> Cc: linux-usb@...r.kernel.org
> Cc: Peng Hao <peng.hao2@....com.cn>
> Cc: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/platform_device.h | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
> index 77a2aada106d..eb8d74744e29 100644
> --- a/include/linux/platform_device.h
> +++ b/include/linux/platform_device.h
> @@ -52,6 +52,19 @@ extern struct device platform_bus;
>  
>  extern struct resource *platform_get_resource(struct platform_device *,
>  					      unsigned int, unsigned int);
> +static inline
> +struct resource *platform_get_mem_or_io_resource(struct platform_device *pdev,

Minor nit: If I would want to break up the long line, I'd use

static inline struct resource *
platform_get_mem_or_io_resource(...)

> +						 unsigned int num)
> +{
> +	struct resource *res;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, num);
> +	if (res)
> +		return res;
> +
> +	return platform_get_resource(pdev, IORESOURCE_IO, num);
> +}
> +
>  extern struct device *
>  platform_find_device_by_driver(struct device *start,
>  			       const struct device_driver *drv);

Reviewed-by: Cornelia Huck <cohuck@...hat.com>