linux-kernel - Re: [PATCH v11 2/3] media: rockchip: Add a driver for Rockchip's camera interface

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Message-ID: <9570dc1c-a437-46d4-95e7-1f3dd399e458@wolfvision.net>
Date:   Wed, 22 Nov 2023 13:42:50 +0100
From:   Michael Riesch <michael.riesch@...fvision.net>
To:     Tommaso Merciai <tomm.merciai@...il.com>,
        Mehdi Djait <mehdi.djait@...tlin.com>
Cc:     mchehab@...nel.org, heiko@...ech.de, hverkuil-cisco@...all.nl,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        conor+dt@...nel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, alexandre.belloni@...tlin.com,
        maxime.chevallier@...tlin.com, paul.kocialkowski@...tlin.com
Subject: Re: [PATCH v11 2/3] media: rockchip: Add a driver for Rockchip's
 camera interface

Hi Tommaso,

On 11/21/23 19:41, Tommaso Merciai wrote:
> Hi Mehdi,
> 
> On Thu, Nov 16, 2023 at 12:04:39PM +0100, Mehdi Djait wrote:
>> This introduces a V4L2 driver for the Rockchip CIF video capture controller.
>>
>> This controller supports multiple parallel interfaces, but for now only the
>> BT.656 interface could be tested, hence it's the only one that's supported
>> in the first version of this driver.
>>
>> This controller can be found on RK3066, PX30, RK1808, RK3128 and RK3288,
>> but for now it's only been tested on the PX30.
>>
>> CIF is implemented as a video node-centric driver.
>>
>> Most of this driver was written following the BSP driver from rockchip,
>> removing the parts that either didn't fit correctly the guidelines, or that
>> couldn't be tested.
>>
>> This basic version doesn't support cropping nor scaling and is only
>> designed with one SDTV video decoder being attached to it at any time.
>>
>> This version uses the "pingpong" mode of the controller, which is a
>> double-buffering mechanism.
>>
>> Signed-off-by: Mehdi Djait <mehdi.djait@...tlin.com>
>> ---
>>  MAINTAINERS                                   |    7 +
>>  drivers/media/platform/rockchip/Kconfig       |    1 +
>>  drivers/media/platform/rockchip/Makefile      |    1 +
>>  drivers/media/platform/rockchip/cif/Kconfig   |   13 +
>>  drivers/media/platform/rockchip/cif/Makefile  |    3 +
>>  drivers/media/platform/rockchip/cif/capture.c | 1120 +++++++++++++++++
>>  drivers/media/platform/rockchip/cif/capture.h |   21 +
>>  drivers/media/platform/rockchip/cif/common.h  |  129 ++
>>  drivers/media/platform/rockchip/cif/dev.c     |  302 +++++
>>  drivers/media/platform/rockchip/cif/regs.h    |  127 ++
>>  10 files changed, 1724 insertions(+)
>>  create mode 100644 drivers/media/platform/rockchip/cif/Kconfig
>>  create mode 100644 drivers/media/platform/rockchip/cif/Makefile
>>  create mode 100644 drivers/media/platform/rockchip/cif/capture.c
>>  create mode 100644 drivers/media/platform/rockchip/cif/capture.h
>>  create mode 100644 drivers/media/platform/rockchip/cif/common.h
>>  create mode 100644 drivers/media/platform/rockchip/cif/dev.c
>>  create mode 100644 drivers/media/platform/rockchip/cif/regs.h
> 
> Just a logigistic comment on my side for now, sorry :)
> What about use cif-* prefix in front of driver files?
> 
> like:
> 
> cif-capture.c
> cif-capture.h
> cif-common.h
> cif-dev.c
> cif-regs.h

What would be the rationale here?

IMHO the files are in a folder named cif, so adding this prefix seems
kind of redundant.

That said, if there is a good reason I could live with cif-*.{c,h} as
well, of course. My only request would be to agree on something ASAP.

> Thanks & Regards,
> Tommaso
> [...]
Best regards,
Michael