linux-kernel - Re: [PATCH] media: i2c: ov7740: add media-controller dependency

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Date:   Tue, 9 Jan 2018 12:13:31 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Wenyou Yang <wenyou.yang@...rochip.com>,
        Songjun Wu <songjun.wu@...rochip.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Pavel Machek <pavel@....cz>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: i2c: ov7740: add media-controller dependency

Hi Arnd,

On Mon, Jan 08, 2018 at 01:52:28PM +0100, Arnd Bergmann wrote:
> Without CONFIG_MEDIA_CONTROLLER, the new driver fails to build:
> 
> drivers/perf/arm_dsu_pmu.c: In function 'dsu_pmu_probe_pmu':
> drivers/perf/arm_dsu_pmu.c:661:2: error: implicit declaration of function 'bitmap_from_u32array'; did you mean 'bitmap_from_arr32'? [-Werror=implicit-function-declaration]

There seems to be a build error with this driver if Media controller is
disabled, but this is not the error message nor adding a dependency to
Media controller is a sound fix for it.

drivers/media/i2c/ov7740.c: In function ‘ov7740_probe’:
drivers/media/i2c/ov7740.c:1139:38: error: ‘struct v4l2_subdev’ has no member named ‘entity’
  media_entity_cleanup(&ov7740->subdev.entity);

I think it'd be worth adding nop variants for functions that are commonly
used by drivers that can be built with or without the Media controller.

I'll send a patch.

> 
> This adds a dependency similar to what we have for other drivers
> like this.
> 
> Fixes: 39c5c4471b8d ("media: i2c: Add the ov7740 image sensor driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/media/i2c/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 9f18cd296841..03cf3a1a1e06 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -667,7 +667,7 @@ config VIDEO_OV7670
>  
>  config VIDEO_OV7740
>  	tristate "OmniVision OV7740 sensor support"
> -	depends on I2C && VIDEO_V4L2
> +	depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
>  	depends on MEDIA_CAMERA_SUPPORT
>  	---help---
>  	  This is a Video4Linux2 sensor-level driver for the OmniVision

-- 
Kind regards,

Sakari Ailus
sakari.ailus@...ux.intel.com