linux-kernel - Re: [PATCH v3 4/5] media: dt-bindings: media: renesas,drif: Add r8a77965 support

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Date:   Wed, 14 Oct 2020 16:51:51 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Ramesh Shanmugasundaram <rashanmu@...il.com>,
        Linux Media Mailing List <linux-media@...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>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v3 4/5] media: dt-bindings: media: renesas,drif: Add
 r8a77965 support

Hi Fabrizio,

On Wed, Oct 14, 2020 at 4:35 PM Fabrizio Castro
<fabrizio.castro.jz@...esas.com> wrote:
> > From: Geert Uytterhoeven <geert@...ux-m68k.org>
> > On Tue, Oct 13, 2020 at 5:02 PM Fabrizio Castro
> > <fabrizio.castro.jz@...esas.com> wrote:
> > > The r8a77965 (a.k.a. R-Car M3-N) device tree schema is
> > > compatible with the already documented R-Car Gen3 devices.
> > >
> > > Document r8a77965 support within renesas,drif.yaml.
> > >
> > > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> >
> > Thanks for your patch!
> >
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >
> > > --- a/Documentation/devicetree/bindings/media/renesas,drif.yaml
> > > +++ b/Documentation/devicetree/bindings/media/renesas,drif.yaml
> > > @@ -53,6 +53,7 @@ properties:
> > >        - enum:
> > >          - renesas,r8a7795-drif        # R-Car H3
> > >          - renesas,r8a7796-drif        # R-Car M3-W
> > > +        - renesas,r8a77965-drif       # R-Car M3-N
> > >          - renesas,r8a77990-drif       # R-Car E3
> > >        - const: renesas,rcar-gen3-drif # Generic R-Car Gen3 compatible device
> >
> > I guess you're aware M3-N (and E3) have an extra register?
> > Probably the driver just relies on its initial value, but it never hurts to be
> > explicit and initialize it properly.
>
> Yes, I am aware of the extra register, and that's reflected in the DRIF nodes
> definition within the SoC specific device trees.
> I'll tackle initialization and configuration of the extra register at some point,
> do you think we could use the default value for now?

Yes, that's fine for me, if it works with the current driver.

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