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Message-ID: <9e02d88a-3344-8d91-c652-72cb989506de@linuxfoundation.org>
Date: Fri, 18 Mar 2022 14:59:05 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Fabio Estevam <festevam@...il.com>,
Felipe Balbi <balbi@...nel.org>,
Florian Fainelli <f.fainelli@...il.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
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Subject: Re: [PATCH 64/64] media: Kconfig: cleanup VIDEO_DEV dependencies
On 3/14/22 1:55 AM, Mauro Carvalho Chehab wrote:
> media Kconfig has two entries associated to V4L API:
> VIDEO_DEV and VIDEO_V4L2.
>
> On Kernel 2.6.x, there were two V4L APIs, each one with its own flag.
> VIDEO_DEV were meant to:
> 1) enable Video4Linux and make its Kconfig options to appear;
> 2) it makes the Kernel build the V4L core.
>
> while VIDEO_V4L2 where used to distinguish between drivers that
> implement the newer API and drivers that implemented the former one.
>
> With time, such meaning changed, specially after the removal of
> all V4L version 1 drivers.
>
> At the current implementation, VIDEO_DEV only does (1): it enables
> the media options related to V4L, that now has:
>
> menu "Video4Linux options"
> visible if VIDEO_DEV
>
> source "drivers/media/v4l2-core/Kconfig"
> endmenu
>
> but it doesn't affect anymore the V4L core drivers.
>
> The rationale is that the V4L2 core has a "soft" dependency
> at the I2C bus, and now requires to select a number of other
> Kconfig options:
>
> config VIDEO_V4L2
> tristate
> depends on (I2C || I2C=n) && VIDEO_DEV
> select RATIONAL
> select VIDEOBUF2_V4L2 if VIDEOBUF2_CORE
> default (I2C || I2C=n) && VIDEO_DEV
>
> In the past, merging them would be tricky, but it seems that it is now
> possible to merge those symbols, in order to simplify V4L dependencies.
>
> Let's keep VIDEO_DEV, as this one is used on some make *defconfig
> configurations.
>
> Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
> ---
>
> drivers/media/test-drivers/vicodec/Kconfig | 2 +-
> drivers/media/test-drivers/vimc/Kconfig | 2 +-
> drivers/media/test-drivers/vivid/Kconfig | 2 +-
>
For vimc change: (trimmed the recipient list to send response)
Acked-by: Shuah Khan <skhan@...uxfoundation.org>
thanks,
-- Shuah
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