linux-kernel - Re: [PATCH v3 01/14] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

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Message-ID: <CAMuHMdWgc2QQu38mqcYrutwKzED-e0-cMUV-vEwa5njqGTB=mg@mail.gmail.com>
Date:   Mon, 26 Aug 2019 10:38:04 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Simon Horman <horms@...ge.net.au>, Ulrich Hecht <uli@...nd.eu>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Koji Matsuoka <koji.matsuoka.xm@...esas.com>, muroya@....co.jp,
        VenkataRajesh.Kalakodima@...bosch.com,
        Harsha.ManjulaMallikarjun@...bosch.com,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v3 01/14] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation

Hi Jacopo,

On Mon, Aug 26, 2019 at 9:58 AM Jacopo Mondi <jacopo@...ndi.org> wrote:
> On Mon, Aug 26, 2019 at 09:34:41AM +0200, Geert Uytterhoeven wrote:
> > On Sun, Aug 25, 2019 at 3:50 PM Jacopo Mondi <jacopo+renesas@...ndi.org> wrote:
> > > Add device tree bindings documentation for the Renesas R-Car Display
> > > Unit Color Management Module.
> > >
> > > CMM is the image enhancement module available on each R-Car DU video
> > > channel on R-Car Gen2 and Gen3 SoCs (V3H and V3M excluded).
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> >
> > Thanks for your patch!
> >
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/display/renesas,cmm.txt
> > > @@ -0,0 +1,33 @@
> > > +* Renesas R-Car Color Management Module (CMM)
> > > +
> > > +Renesas R-Car image enhancement module connected to R-Car DU video channels.
> > > +
> > > +Required properties:
> > > + - compatible: shall be one or more of the following:
> > > +   - "renesas,cmm-r8a7795": for R8A7795 (R-Car H3) compatible CMM.
> > > +   - "renesas,cmm-r8a7796": for R8A7796 (R-Car M3-W) compatible CMM.
> > > +   - "renesas,cmm-r8a77965": for R8A77965 (R-Car M3-N) compatible CMM.
> > > +   - "renesas,cmm-r8a77990": for R8A77990 (R-Car E3) compatible CMM.
> > > +   - "renesas,cmm-r8a77995": for R8A77995 (R-Car D3) compatible CMM.
> >
> > Please use "renesas,<socype->-cmm" instead of "renesas,cmm-<soctype>".
> >
>
> I actually copied it from the r-car gpio bindings, and I liked
> cmm-<soctype> better. If you prefer I can change it though.

We switched from "renesas,cmm-<soctype>" to "renesas,<socype->-cmm"
a few years ago, upon request from the DT people:

    vendor -> family/SoC -> IP core

Unfortunately we cannot change the old style in existing bindings, without
great effort and backwards compatibility ramifications.

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