Hi, On Mon, Apr 06, 2020 at 02:39:31AM +0300, Laurent Pinchart wrote: > diff --git a/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.yaml b/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.yaml > new file mode 100644 > index 000000000000..9a543740c81d > --- /dev/null > +++ b/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.yaml > @@ -0,0 +1,142 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/display/bridge/renesas,dw-hdmi.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Renesas R-Car DWC HDMI TX Encoder > + > +maintainers: > + - Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> > + > +description: | > + The HDMI transmitter is a Synopsys DesignWare HDMI 1.4 TX controller IP > + with a companion PHY IP. > + > +allOf: > + - $ref: synopsys,dw-hdmi.yaml# > + > +properties: > + compatible: > + items: > + - enum: > + - renesas,r8a774a1-hdmi # for R8A774A1 (RZ/G2M) compatible HDMI TX > + - renesas,r8a774b1-hdmi # for R8A774B1 (RZ/G2N) compatible HDMI TX > + - renesas,r8a7795-hdmi # for R8A7795 (R-Car H3) compatible HDMI TX > + - renesas,r8a7796-hdmi # for R8A7796 (R-Car M3-W) compatible HDMI TX > + - renesas,r8a77965-hdmi # for R8A77965 (R-Car M3-N) compatible HDMI TX > + - const: renesas,rcar-gen3-hdmi > + > + reg: true > + > + reg-io-width: > + const: 1 > + > + clocks: > + minItems: 2 > + maxItems: 2 You don't need both, if one is missing the other will be filled by the dt-schema tools. In this particular case, I guess maxItems would make more sense. > + > + clock-names: > + items: > + - const: iahb > + - const: isfr > + > + interrupts: true > + > + ports: > + type: object > + description: | > + This device has three video ports. Their connections are modelled using the > + OF graph bindings specified in Documentation/devicetree/bindings/graph.txt. > + Each port shall have a single endpoint. > + > + properties: > + '#address-cells': > + const: 1 > + > + '#size-cells': > + const: 0 > + > + port@0: > + type: object > + description: Parallel RGB input port > + > + port@1: > + type: object > + description: HDMI output port > + > + port@2: > + type: object > + description: Sound input port > + > + required: > + - port@0 > + - port@1 > + - port@2 > + > + additionalProperties: false > + > + power-domains: > + maxItems: 1 > + > +required: > + - compatible > + - reg > + - clocks > + - clock-names > + - interrupts > + - ports > + > +additionalProperties: false In the case where you have some kind of generic schema and then a more specific one like you have here, unevaluatedProperties make more sense that additionalProperties. additionalProperties checks that there are no extra properties on the current schema, which is a problem here since you have to duplicate the entire list of properties found in the generic schema, while unevaluatedProperties checks that there are no extra properties in the entire set of all schemas that apply to this node. This way, you can just put what is different from the generic schema, and you don't have to keep it in sync. It's a feature that has been added in the spec of the schemas that went on right after the one we support in the tools, so for now the kernel meta-schemas only allows that property to be there (just like deprecated) but won't do anything. This should be fixed quite soon however, the library we depend on has started to work on that spec apparently. Maxime
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