linux-kernel - Re: [RFC PATCH v5 6/9] media: tegra: Add Tegra210 Video input driver

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Date:   Wed, 25 Mar 2020 12:09:40 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Sakari Ailus <sakari.ailus@....fi>,
        Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        helen.koike@...labora.com, digetx@...il.com, sboyd@...nel.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v5 6/9] media: tegra: Add Tegra210 Video input driver

On 3/25/20 12:03 PM, Sakari Ailus wrote:
> Hi Sowjanya,
> 
> Thanks for the patchset.
> 
> On Mon, Mar 23, 2020 at 10:52:32AM -0700, Sowjanya Komatineni wrote:
>> Tegra210 contains a powerful Video Input (VI) hardware controller
>> which can support up to 6 MIPI CSI camera sensors.
>>
>> Each Tegra CSI port can be one-to-one mapped to VI channel and can
>> capture from an external camera sensor connected to CSI or from
>> built-in test pattern generator.
>>
>> Tegra210 supports built-in test pattern generator from CSI to VI.
>>
>> This patch adds a V4L2 media controller and capture driver support
>> for Tegra210 built-in CSI to VI test pattern generator.
>>
>> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
>> ---
>>  drivers/staging/media/Kconfig              |    2 +
>>  drivers/staging/media/Makefile             |    1 +
>>  drivers/staging/media/tegra/Kconfig        |   10 +
>>  drivers/staging/media/tegra/Makefile       |    8 +
>>  drivers/staging/media/tegra/TODO           |   10 +
>>  drivers/staging/media/tegra/tegra-common.h |  263 +++++++
>>  drivers/staging/media/tegra/tegra-csi.c    |  522 ++++++++++++++
>>  drivers/staging/media/tegra/tegra-csi.h    |  118 ++++
>>  drivers/staging/media/tegra/tegra-vi.c     | 1058 ++++++++++++++++++++++++++++
>>  drivers/staging/media/tegra/tegra-vi.h     |   83 +++
>>  drivers/staging/media/tegra/tegra-video.c  |  129 ++++
>>  drivers/staging/media/tegra/tegra-video.h  |   32 +
>>  drivers/staging/media/tegra/tegra210.c     |  754 ++++++++++++++++++++
>>  drivers/staging/media/tegra/tegra210.h     |  192 +++++
> 
> Why staging? Are there reasons not to aim this to the kernel proper right
> away? If you only support TPG, the driver may not have too many (if any)
> real users anyway.

A TPG-only driver is not very useful, and I do not believe that belongs in
the kernel proper. The next phase will add sensor support, and that's a good
time to move it in the kernel itself.

Regards,

	Hans