On Thu, Apr 4, 2024 at 4:16 PM AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> wrote: > > Document OF graph on MMSYS/VDOSYS: this supports up to three DDP paths > per HW instance (so potentially up to six displays for multi-vdo SoCs). > > The MMSYS or VDOSYS is always the first component in the DDP pipeline, > so it only supports an output port with multiple endpoints - where each > endpoint defines the starting point for one of the (currently three) > possible hardware paths. > > Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> > --- > .../bindings/arm/mediatek/mediatek,mmsys.yaml | 23 +++++++++++++++++++ > 1 file changed, 23 insertions(+) > > diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml > index b3c6888c1457..90758bb5bcb1 100644 > --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml > +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml > @@ -93,6 +93,29 @@ properties: > '#reset-cells': > const: 1 > > + port: > + $ref: /schemas/graph.yaml#/properties/port > + description: > + Output port node. This port connects the MMSYS/VDOSYS output to > + the first component of one display pipeline, for example one of > + the available OVL or RDMA blocks. > + Some MediaTek SoCs support up to three display outputs per MMSYS. > + properties: > + endpoint@0: > + $ref: /schemas/graph.yaml#/properties/endpoint > + description: Output to the primary display pipeline > + > + endpoint@1: > + $ref: /schemas/graph.yaml#/properties/endpoint > + description: Output to the secondary display pipeline > + > + endpoint@2: > + $ref: /schemas/graph.yaml#/properties/endpoint > + description: Output to the tertiary display pipeline > + > + required: > + - endpoint@0 > + Technically the mmsys device serves as an glue layer for the display pipeline, providing things like clock control and signal routing; the device itself is not part of the pipeline, and probably shouldn't be part of the graph? ChenYu > required: > - compatible > - reg > -- > 2.44.0 >
