linux-kernel - Re: [PATCH] media: atomisp: add I2C dependency

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Date:   Thu, 2 Feb 2023 22:34:41 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: atomisp: add I2C dependency

Hi Arnd,

On 2/2/23 22:02, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Without CONFIG_I2C, atomisp fails to build because of a missing
> function declaration:
> 
> drivers/staging/media/atomisp/pci/atomisp_v4l2.c: In function 'atomisp_subdev_probe':
> drivers/staging/media/atomisp/pci/atomisp_v4l2.c:960:21: error: implicit declaration of function 'i2c_get_adapter'; did you mean 'i2c_get_adapdata'? [-Werror=implicit-function-declaration]
>   960 |                     i2c_get_adapter(subdevs->v4l2_subdev.i2c_adapter_id);
>       |                     ^~~~~~~~~~~~~~~
>       |                     i2c_get_adapdata
> 
> Ideally the driver should just move away from calling i2c_get_adapter
> as explained in a comment near the call. For now, just use a Kconfig
> dependency. Apparently configurations with I2C disabled are rare in
> practice as well as in randconfig builds because a lot of other
> drivers 'select' the subsystem.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Actually the i2c_get_adapter() call is gone in the atomisp pull-req
which I send to Mauro for 6.3, it is removed by this patch.

https://git.kernel.org/pub/scm/linux/kernel/git/hansg/linux.git/commit/?h=media-atomisp-6.3-1&id=4f205ce7a915ffa4ae0fb24f48714604d39baa29

So adding the I2C dependency is no longer necessary.

Regards,

Hans






> ---
>  drivers/staging/media/atomisp/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/media/atomisp/Kconfig b/drivers/staging/media/atomisp/Kconfig
> index c9bff98e5309..8b0de0b5b4a3 100644
> --- a/drivers/staging/media/atomisp/Kconfig
> +++ b/drivers/staging/media/atomisp/Kconfig
> @@ -13,6 +13,7 @@ config VIDEO_ATOMISP
>  	tristate "Intel Atom Image Signal Processor Driver"
>  	depends on VIDEO_DEV && INTEL_ATOMISP
>  	depends on PMIC_OPREGION
> +	depends on I2C
>  	select IOSF_MBI
>  	select VIDEOBUF2_VMALLOC
>  	select VIDEO_V4L2_SUBDEV_API