linux-kernel - Re: [PATCH v3 6a/7] dt-bindings: Add ANX6345 DP/eDP transmitter binding

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Message-ID: <CAL_JsqKAU3WG3L=KP8A8u4vW=q_BQWPN-m_c+ADOwTioJ2-cmg@mail.gmail.com>
Date:   Mon, 29 Jul 2019 17:54:21 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Torsten Duwe <duwe@....de>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Sean Paul <seanpaul@...omium.org>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Harald Geyer <harald@...ib.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 6a/7] dt-bindings: Add ANX6345 DP/eDP transmitter binding

On Mon, Jul 29, 2019 at 8:23 AM Torsten Duwe <duwe@....de> wrote:
>
> On Fri, Jul 26, 2019 at 06:36:01PM +0200, Maxime Ripard wrote:
> > > +
> > > +  dvdd12-supply:
> > > +    maxItems: 1
> > > +    description: Regulator for 1.2V digital core power.
> > > +    $ref: /schemas/types.yaml#/definitions/phandle
> > > +
> > > +  dvdd25-supply:
> > > +    maxItems: 1
> > > +    description: Regulator for 2.5V digital core power.
> > > +    $ref: /schemas/types.yaml#/definitions/phandle
> >
> > There's no need to specify the type here, all the properties ending in
> > -supply are already checked for that type
>
> Ok, thanks for the hint.
>
> > > +  ports:
> > > +    type: object
> > > +    minItems: 1
> > > +    maxItems: 2
> > > +    description: |
> > > +      Video port 0 for LVTTL input,
> > > +      Video port 1 for eDP output (panel or connector)
> > > +      using the DT bindings defined in
> > > +      Documentation/devicetree/bindings/media/video-interfaces.txt
> >
> > You should probably describe the port@0 and port@1 nodes here as
> > well. It would allow you to express that the port 0 is mandatory and
> > the port 1 optional, which got dropped in the conversion.
>
> I would have liked to, but have not discovered yet a comprehensive source
> of information about recommended syntax and semantics of the YAML schemes.

The language is json-schema.

> Is there some central reference for these types of issues? I mean not the
> "here is a git repo with the meta-schemes" but sort of a cookbook?

Documentation/devicetree/writing-schema.md (soon .rst) and
Documentation/devicetree/bindings/example-schema.yaml attempt to do
this. Any feedback on them would be helpful.

For this case specifically, we do need to define a common graph
schema, but haven't yet. You can assume we do and only really need to
capture what Maxime said above.

Rob