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Document the Parallel Display Format Configuration(PDFC) subnode >>> and add the subnode to example. >>> >>> Reviewed-by: Rob Herring (Arm) >>> Signed-off-by: Liu Ying >>> [m.felsch@pengutronix.de: port to v7.0-rc1] >>> [m.felsch@pengutronix.de: add bus-width] >>> Signed-off-by: Marco Felsch >>> --- >>> .../bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml | 78 ++++++++++++++++++++++ >>> 1 file changed, 78 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml >>> index 34aea58094e55365a2f9c86092f637e533f954ff..d828c2e82965c7a4cd69a67136047d83c96b0a35 100644 >>> --- a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml >>> +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml >>> @@ -40,6 +40,58 @@ properties: >>> minItems: 8 >>> maxItems: 10 >>> >>> + dpi-bridge: >> >> Cc'ing Frank. >> >> fsl,ldb.yaml documents fsl,imx6sx-ldb, fsl,imx8mp-ldb and fsl,imx93-ldb >> with a reg property. Since all of them are child devices of either GPR >> or BLK_CTRL and this dpi-bridge is a child device of BLK_CTRL without a >> reg property, how can we handle the inconsistency? At least, with this >> patch and the current fsl,ldb.yaml, we cannot add an i.MX93 LDB child >> node. > > This reg property was longly discussed and there should be no reg > because this 'reg' covers not only the PDFC register fields. Please see > the discussion: > > - https://lore.kernel.org/all/PAXPR04MB84599D676EC1E3879694579688B2A@PAXPR04MB8459.eurprd04.prod.outlook.com/ > > The LDB node shouldn't have a reg property in the first place. There are > a few registers within BLK-CTRL which belong to only one "IP" like the > LDB. But these are the exception rather than the rule. To make it > possible to abstract _all_ sub-devices within the BLK control you need > to drop the reg property. The subdevice drivers need to handle the > offsets within the BLK-CTRL accordingly, like the LDB driver already > does. So removing the reg property from the LDB dt-bindings is the > correct fix. Hmm, reg property was added intentionally by the below commit. But, I'm not saying removing the reg property is not a correct fix. Just feel embarrassing to see that it was added and then to be removed. 16c8d76abe83 dt-bindings: display: bridge: ldb: Fill in reg property Can you contribute patches to get this done if you think it's a correct fix? > > Regards, > Marco > >>> + type: object >>> + additionalProperties: false >>> + >>> + properties: >>> + compatible: >>> + enum: >>> + - nxp,imx91-pdfc >>> + - nxp,imx93-pdfc >>> + >>> + ports: >>> + $ref: /schemas/graph.yaml#/properties/ports >>> + >>> + properties: >>> + port@0: >>> + $ref: /schemas/graph.yaml#/properties/port >>> + description: Input port node to receive pixel data. >>> + >>> + port@1: >>> + $ref: /schemas/graph.yaml#/$defs/port-base >>> + unevaluatedProperties: false >>> + description: Output port node to downstream pixel data receivers. >>> + >>> + properties: >>> + endpoint: >>> + $ref: /schemas/media/video-interfaces.yaml# >>> + unevaluatedProperties: false >>> + >>> + properties: >>> + bus-width: >>> + enum: [ 16, 18, 24 ] >>> + description: >>> + Specify the physical parallel bus width. >>> + >>> + This property is optional if the display bus-width >>> + matches the SoC bus-width, e.g. a 18-bit RGB666 (display) >>> + is connected and all 18-bit data lines are muxed to the >>> + parallel-output pads. >>> + >>> + This property must be set to 18 to cut only the LSBs >>> + instead of the MSBs in case a 24-bit RGB888 display is >>> + connected and only the lower 18-bit data lanes are muxed >>> + to the parallel-output pads. >>> + >>> + required: >>> + - port@0 >>> + - port@1 >>> + >>> + required: >>> + - compatible >>> + - ports >>> + >>> allOf: >>> - if: >>> properties: >>> @@ -112,4 +164,30 @@ examples: >>> clock-names = "apb", "axi", "nic", "disp", "cam", >>> "pxp", "lcdif", "isi", "csi", "dsi"; >>> #power-domain-cells = <1>; >>> + >>> + dpi-bridge { >>> + compatible = "nxp,imx93-pdfc"; >>> + >>> + ports { >>> + #address-cells = <1>; >>> + #size-cells = <0>; >>> + >>> + port@0 { >>> + reg = <0>; >>> + >>> + pdfc_from_lcdif: endpoint { >>> + remote-endpoint = <&lcdif_to_pdfc>; >>> + }; >>> + }; >>> + >>> + port@1 { >>> + reg = <1>; >>> + >>> + pdfc_to_panel: endpoint { >>> + remote-endpoint = <&panel_from_pdfc>; >>> + bus-width = <18>; >>> + }; >>> + }; >>> + }; >>> + }; >>> }; >>> >> >> -- >> Regards, >> Liu Ying >> > -- Regards, Liu Ying