linux-kernel - Re: [RFC PATCH v2 1/4] media: dt-bindings: media: Document RZ/G2L CSI-2 block

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Message-ID: <CAMuHMdWnTxxXz-aBL10nSiQt67bm93yXHbSvFtrs3Yme9ZQcpg@mail.gmail.com>
Date:   Fri, 21 Jan 2022 10:26:10 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Niklas Söderlund <niklas.soderlund@...natech.se>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [RFC PATCH v2 1/4] media: dt-bindings: media: Document RZ/G2L
 CSI-2 block

Hi Prabhakar,

On Fri, Jan 21, 2022 at 2:06 AM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> Document the CSI-2 block which is part of CRU found in Renesas
> RZ/G2L SoC.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Thanks for your patch!

> ---
> Hi Geert/All,
>
> vclk and pclk clocks are shared with CRU both CSI and CRU driver are using
> pm_runtime. pclk clock is necessary for register access where as vclk clock
> is only used for calculations. So would you suggest passing vclk as part of

What do you mean by "calculations"?
The bindings say this is the main clock?

> clocks (as currently implemented) or pass the vclk clock rate as a dt property.

Please do not specify clock rates in DT, but always pass clock
specifiers instead.
The clock subsystem handles sharing of clocks just fine.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds