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From:   Rob Herring <robh+dt@kernel.org>
Date:   Mon, 28 Sep 2020 11:28:29 -0500
Message-ID: <CAL_JsqLUT9gBiVgSdcHM86vNLR_1MxEZ+x9MDBaFGdv2j9EtvA@mail.gmail.com>
Subject: Re: [PATCH RFC v7 1/6] dt-bindings: display: add Unisoc's drm master bindings
To:     Maxime Ripard <maxime@cerno.tech>,
        Kevin Tang <kevin3.tang@gmail.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Mark Rutland <mark.rutland@arm.com>,
        Orson Zhai <orsonzhai@gmail.com>,
        Lyra Zhang <zhang.lyra@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>
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On Mon, Sep 28, 2020 at 3:17 AM Maxime Ripard <maxime@cerno.tech> wrote:
>
> Hi!
>
> On Mon, Sep 28, 2020 at 02:27:35PM +0800, Kevin Tang wrote:
> > From: Kevin Tang <kevin.tang@unisoc.com>
> >
> > The Unisoc DRM master device is a virtual device needed to list all
> > DPU devices or other display interface nodes that comprise the
> > graphics subsystem
> >
> > RFC v7:
> >   - Fix DTC unit name warnings
> >   - Fix the problem of maintainers
> >
> > Cc: Orson Zhai <orsonzhai@gmail.com>
> > Cc: Chunyan Zhang <zhang.lyra@gmail.com>
> > Signed-off-by: Kevin Tang <kevin.tang@unisoc.com>
> > ---
> >  .../display/sprd/sprd,display-subsystem.yaml       | 39 ++++++++++++++++++++++
> >  1 file changed, 39 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml b/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml
> > new file mode 100644
> > index 0000000..9487a39
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml
> > @@ -0,0 +1,39 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/display/sprd/sprd,display-subsystem.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Unisoc DRM master device
> > +
> > +maintainers:
> > +  - Kevin Tang <kevin.tang@unisoc.com>
> > +
> > +description: |
> > +  The Unisoc DRM master device is a virtual device needed to list all
> > +  DPU devices or other display interface nodes that comprise the
> > +  graphics subsystem.
> > +
> > +properties:
> > +  compatible:
> > +    const: sprd,display-subsystem
> > +
> > +  ports:
> > +    $ref: /schemas/types.yaml#/definitions/phandle-array
> > +    description:
> > +      Should contain a list of phandles pointing to display interface port
> > +      of DPU devices.
>
> Generally speaking, driver-specific properties should be prefixed by the
> vendor name to avoid any conflict with generic properties (like the
> OF-Graph ports subnode in this case)

We try to avoid this virtual node altogether which I commented about
on v6 which was ignored.

Rob