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

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Message-ID: <ZV4DPsL4zkDkAuwj@tom-HP-ZBook-Fury-15-G7-Mobile-Workstation>
Date:   Wed, 22 Nov 2023 14:33:50 +0100
From:   Tommaso Merciai <tomm.merciai@...il.com>
To:     Michael Riesch <michael.riesch@...fvision.net>
Cc:     Mehdi Djait <mehdi.djait@...tlin.com>, 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 Michael,
Thanks for your comment.

On Wed, Nov 22, 2023 at 01:42:50PM +0100, Michael Riesch wrote:
> 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.

Others platform drivers are using this pattern prefix.
Please check:

tree -l 2 ./drivers/media/platform/

Would be better for me to align with this common pattern.
But this is my personal idea :)

Thanks & Regards,
Tommaso

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