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From:   "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Date:   Mon, 9 Mar 2020 22:28:26 +0000
Message-ID: <CA+V-a8uRD2Vi05rPw2fw6SQO66EHWG=Z+ZAL23xR_9QSVz7WBw@mail.gmail.com>
Subject: Re: [RESEND PATCH v7] dt-bindings: display: Add idk-2121wr binding
To:     Sam Ravnborg <sam@ravnborg.org>
Cc:     Rob Herring <robh@kernel.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Mark Rutland <mark.rutland@arm.com>,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Chris Paterson <Chris.Paterson2@renesas.com>,
        dri-devel@lists.freedesktop.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
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Hi Sam,

On Mon, Mar 9, 2020 at 9:47 PM Sam Ravnborg <sam@ravnborg.org> wrote:
>
> Hi Prabhakar
>
> On Mon, Mar 09, 2020 at 09:23:24PM +0000, Lad, Prabhakar wrote:
> > Hi Rob,
> >
> > On Mon, Mar 9, 2020 at 8:32 PM Rob Herring <robh@kernel.org> wrote:
> > >
> > > On Fri,  6 Mar 2020 15:20:31 +0000, Lad Prabhakar wrote:
> > > > From: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> > > >
> > > > Add binding for the idk-2121wr LVDS panel from Advantech.
> > > >
> > > > Some panel-specific documentation can be found here:
> > > > https://buy.advantech.eu/Displays/Embedded-LCD-Kits-High-Brightness/model-IDK-2121WR-K2FHA2E.htm
> > > >
> > > > Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > > > ---
> > > > Apologies for flooding in I missed to add the ML email-ids for the earlier
> > > > version so resending it.
> > > >
> > > > Hi All,
> > > >
> > > > This patch is part of series [1] ("Add dual-LVDS panel support to EK874),
> > > > all the patches have been accepted from it except this one. I have fixed
> > > > Rob's comments in this version of the patch.
> > > >
> > > > [1] https://patchwork.kernel.org/cover/11297589/
> > > >
> > > > v6->7
> > > >  * Added reference to lvds.yaml
> > > >  * Changed maintainer to myself
> > > >  * Switched to dual license
> > > >  * Dropped required properties except for ports as rest are already listed
> > > >    in lvds.panel
> > > >  * Dropped Reviewed-by tag of Laurent, due to the changes made it might not
> > > >    be valid.
> > > >
> > > > v5->v6:
> > > >  * No change
> > > >
> > > > v4->v5:
> > > > * No change
> > > >
> > > > v3->v4:
> > > > * Absorbed patch "dt-bindings: display: Add bindings for LVDS
> > > >   bus-timings"
> > > > * Big restructuring after Rob's and Laurent's comments
> > > >
> > > > v2->v3:
> > > > * New patch
> > > >
> > > >  .../display/panel/advantech,idk-2121wr.yaml        | 120 +++++++++++++++++++++
> > > >  1 file changed, 120 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.yaml
> > > >
> > >
> > > My bot found errors running 'make dt_binding_check' on your patch:
> > >
> > > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.example.dt.yaml: panel-lvds: 'port' is a required property
> > > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.example.dt.yaml: panel-lvds: 'port' is a required property
> > >
> > This panel is a dual channel LVDS, as a result the root port is called as
> > ports instead of port and the child node port@0 and port@1 are used for
> > even and odd pixels, hence binding has required property as ports instead
> > of port.
>
> What goes wrong is that you have a ref to lvds.yaml - and thus you get
> also required from that file.
>
Agreed.

> So basically - I think this binding should not have a ref to lvds.yaml -
> as the binding needs to be different.
>
Yes makes sense, will post a v8 dropping the reference to lvds.yaml

Cheers,
--Prabhakar

>         Sam