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

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Message-ID: <20190905122059.GK5035@pendragon.ideasonboard.com>
Date:   Thu, 5 Sep 2019 15:20:59 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jacopo Mondi <jacopo@...ndi.org>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        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 Geert,

On Thu, Sep 05, 2019 at 02:05:34PM +0200, Geert Uytterhoeven wrote:
> On Thu, Sep 5, 2019 at 1:50 PM Laurent Pinchart wrote:
> > On Fri, Aug 30, 2019 at 08:01:09PM +0200, Jacopo Mondi wrote:
> > > On Mon, Aug 26, 2019 at 01:15:50PM +0300, Laurent Pinchart wrote:
> > > > How about converting this binding to yaml alreay ? It should be fairly
> > > > simple.
> > >
> > > I'm trying to, and I'm having my portion of fun time at it.
> > >
> > > The definition of the schema itself seems good, but I wonder, is this
> > > the first renesas schema we have? Because it seems to me the schema
> > > validator is having an hard time to digest the examplea 'clocks' and
> > > 'power-domains' properties, which have 1 phandle and 2 specifiers and 1
> > > phandle and 1 specifier respectively for Rensas SoCs.
> > >
> > > In other words, if in the example I have:
> > >
> > >  examples:
> > >    - |
> > >      cmm0: cmm@...40000 {
> > >           compatible = "renesas,r8a7796-cmm";
> > >           reg = <0 0xfea40000 0 0x1000>;
> > >           clocks = <&cpg 711>              <---- 1 phandle + 1 specifier
> > >           resets = <&cpg 711>;
> > >           power-domains = <&sysc>;         <---- 1 phandle
> > >      };
> > >
> > > The schema validation is good.
> > >
> > > While if I use an actual example
> > >    - |
> > >      cmm0: cmm@...40000 {
> > >           compatible = "renesas,r8a7796-cmm";
> > >           reg = <0 0xfea40000 0 0x1000>;
> > >           clocks = <&cpg CPG_MOD 711>         <---- 1 phandle + 2 specifier
> > >           resets = <&cpg 711>;
> > >           power-domains = <&sysc R8A7796_PD_ALWAYS_ON>; <---- 1 phandle
> > >      };                                                       + 1 specfier
> > >
> > > The schema validation fails...
> > > Error: Documentation/devicetree/bindings/display/renesas,cmm.example.dts:20.29-30 syntax error
> > > FATAL ERROR: Unable to parse input tree
> > >
> > > Are clocks properties with > 2 entries and power-domains properties with
> > > > 1 entries supported?
> > >
> > > Because from what I read here:
> > > https://github.com/robherring/yaml-bindings/blob/master/schemas/clock/clock.yaml
> > > "The length of a clock specifier is defined by the value of a #clock-cells
> > > property in the clock provider node."
> > >
> > > And that's expected, but is the examples actually validated against the
> > > clock provider pointed by the phandle? Because in that case, if we had a
> > > yaml schema for the cpg-mssr provider, it would indeed specify clock-cells=2.
> > >
> > > Do we need a schema for cpg-mssr first, or am I doing something else
> > > wrong?
> >
> > I think you just need to #include the headers that define CPG_MOD and
> > R8A7796_PD_ALWAYS_ON.
> 
> If that helps, you might want to replace the symbols in the examples by their
> actual values (1 resp. 32).
> 
> And perhaps keep the symbols as comments?
> 
>         clocks = <&cpg 1 /* CPG_MOD */ 711>;
>         power-domains = <&sysc 32 /* R8A7796_PD_ALWAYS_ON */>;

I think adding the required #include at the beginning of the example is
a better solution.

-- 
Regards,

Laurent Pinchart