<div dir="ltr"><div dir="ltr"> </div> <div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Feb 28, 2020 at 12:50 AM Rob Herring <<a href="mailto:robh%2Bdt@kernel.org">robh+dt@kernel.org</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On Wed, Feb 26, 2020 at 3:46 AM Kevin Tang <<a href="mailto:kevin3.tang@gmail.com" target="_blank">kevin3.tang@gmail.com</a>> wrote: > > From: Kevin Tang <<a href="mailto:kevin.tang@unisoc.com" target="_blank">kevin.tang@unisoc.com</a>> > > 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 > > Cc: Orson Zhai <<a href="mailto:orsonzhai@gmail.com" target="_blank">orsonzhai@gmail.com</a>> > Cc: Baolin Wang <<a href="mailto:baolin.wang@linaro.org" target="_blank">baolin.wang@linaro.org</a>> > Cc: Chunyan Zhang <<a href="mailto:zhang.lyra@gmail.com" target="_blank">zhang.lyra@gmail.com</a>> > Signed-off-by: Kevin Tang <<a href="mailto:kevin.tang@unisoc.com" target="_blank">kevin.tang@unisoc.com</a>> > --- > .../devicetree/bindings/display/sprd/drm.yaml | 36 ++++++++++++++++++++++ > 1 file changed, 36 insertions(+) > create mode 100644 Documentation/devicetree/bindings/display/sprd/drm.yaml > > diff --git a/Documentation/devicetree/bindings/display/sprd/drm.yaml b/Documentation/devicetree/bindings/display/sprd/drm.yaml > new file mode 100644 > index 0000000..b5792c0 > --- /dev/null > +++ b/Documentation/devicetree/bindings/display/sprd/drm.yaml > @@ -0,0 +1,36 @@ > +# SPDX-License-Identifier: GPL-2.0 > +%YAML 1.2 > +--- > +$id: <a href="http://devicetree.org/schemas/display/sprd/drm.yaml#" rel="noreferrer" target="_blank">http://devicetree.org/schemas/display/sprd/drm.yaml#</a> > +$schema: <a href="http://devicetree.org/meta-schemas/core.yaml#" rel="noreferrer" target="_blank">http://devicetree.org/meta-schemas/core.yaml#</a> > + > +title: Unisoc DRM master device > + > +maintainers: > + - Mark Rutland <<a href="mailto:mark.rutland@arm.com" target="_blank">mark.rutland@arm.com</a>> > + > +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: > + description: > + Should contain a list of phandles pointing to display interface port > + of DPU devices. > + > +required: > + - compatible > + - ports > + > +examples: > + - | > + display-subsystem { > + compatible = "sprd,display-subsystem"; > + ports = <&dpu_out>; We try to avoid these virtual nodes and bind with actual h/w nodes. Can you have more than one DPU and if so does it need to be a single DRM driver instance? </blockquote><div>I don't really understand what you mean, so reply as I understand... </div><div>"dpu_out" node is the real h/w node, defined on dpu.yaml</div><div>Yeah, we will be have multi DPU </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> Rob </blockquote></div></div>