Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <20220121010543.31385-1-prabhakar.mahadev-lad.rj@bp.renesas.com> <20220121010543.31385-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
In-Reply-To: <20220121010543.31385-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Fri, 21 Jan 2022 10:26:10 +0100
Message-ID: <CAMuHMdWnTxxXz-aBL10nSiQt67bm93yXHbSvFtrs3Yme9ZQcpg@mail.gmail.com>
Subject: Re: [RFC PATCH v2 1/4] media: dt-bindings: media: Document RZ/G2L
 CSI-2 block
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc:     =?UTF-8?Q?Niklas_S=C3=B6derlund?= <niklas.soderlund@ragnatech.se>,
        Jacopo Mondi <jacopo@jmondi.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Linux Media Mailing List <linux-media@vger.kernel.org>,
        Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Prabhakar <prabhakar.csengg@gmail.com>,
        Biju Das <biju.das.jz@bp.renesas.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hi Prabhakar,

On Fri, Jan 21, 2022 at 2:06 AM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.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@bp.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@linux-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