RE: [RFC 1/8] dt-bindings: media: Document Synopsys DesignWare HDMI RX

[Nelson Costa]

Hi Laurent,

Thanks for the feedback!

From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Date: qua, abr 28, 2021 at 23:01:41

> Hi Nelson and Jose,
> 
> Thank you for the patch.
> 
> On Wed, Apr 28, 2021 at 05:25:04PM +0200, Nelson Costa wrote:
> > Document the bindings for the Synopsys DesignWare HDMI RX.
> > 
> > Signed-off-by: Jose Abreu <jose.abreu@xxxxxxxxxxxx>
> > Signed-off-by: Nelson Costa <nelson.costa@xxxxxxxxxxxx>
> > ---
> >  .../devicetree/bindings/media/snps,dw-hdmi-rx.yaml | 149 +++++++++++++++++++++
> >  1 file changed, 149 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> > new file mode 100644
> > index 0000000..19c7dd4
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> > @@ -0,0 +1,149 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: https://urldefense.com/v3/__http://devicetree.org/schemas/media/snps,dw-hdmi-rx.yaml*__;Iw!!A4F2R9G_pg!KZ4lOoXlRjAtJ4GvM28AiL2SL8KFjt9Qsy2J0a1BQDnAujAAZD0vPA_7DJzM0XR8J54$ 
> > +$schema: https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!A4F2R9G_pg!KZ4lOoXlRjAtJ4GvM28AiL2SL8KFjt9Qsy2J0a1BQDnAujAAZD0vPA_7DJzME7h7a-A$ 
> > +
> > +title: Synopsys DesignWare HDMI RX Controller and PHYs e405/e406 Device Tree Bindings
> > +
> > +maintainers:
> > +  - Jose Abreu <jose.abreu@xxxxxxxxxxxx>
> > +  - Nelson Costa <nelson.costa@xxxxxxxxxxxx>
> > +
> > +description: |
> > +  The Synopsys DesignWare HDMI RX Controller and PHYs e405/e406 is an HDMI 2.0
> > +  Receiver solution that is able to decode video and audio.
> > +
> > +properties:
> > +  compatible:
> > +    const: snps,dw-hdmi-rx
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +    description: phandle to the configuration clock
> > +
> > +  clock-names:
> > +    const: cfg
> > +
> > +  "#address-cells":
> > +    const: 1
> > +
> > +  "#size-cells":
> > +    const: 0
> > +
> > +  phys:
> > +    maxItems: 1
> > +    description: phandle for the HDMI RX PHY
> > +
> > +  phy-names:
> > +    const: hdmi-phy
> > +
> > +  hdmi-phy@fc:
> > +    type: object
> > +    description: connection point for HDMI PHY
> > +    additionalProperties: false
> > +
> > +    properties:
> > +      compatible:
> > +        oneOf:
> > +          - const: snps,dw-hdmi-phy-e405
> > +          - const: snps,dw-hdmi-phy-e406
> > +
> > +      reg:
> > +        maxItems: 1
> > +
> > +      clocks:
> > +        maxItems: 1
> > +        description: phandle to the configuration clock
> > +
> > +      clock-names:
> > +        const: cfg
> > +
> > +      "#phy-cells":
> > +        const: 0
> > +
> > +      input-count:
> > +        description: Number of PHY input ports
> > +        $ref: /schemas/types.yaml#/definitions/uint32
> > +        enum: [1, 2, 3, 4]
> > +
> > +    required:
> > +      - compatible
> > +      - reg
> > +      - clocks
> > +      - clock-names
> > +      - "#phy-cells"
> > +      - input-count
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +  - clock-names
> > +  - "#address-cells"
> > +  - "#size-cells"
> > +  - phys
> > +  - phy-names
> 
> THe bindings should be using OF graph (ports) to model the connection
> between the HDMI source (usually a connector) and the HDMI RX, and
> between the HDMI RX and the downstream IP core in the pipeline.
> 

This will be addressed in the next patch series.

BTW, do you have any suggestion regarding an eventual good driver & dt 
example/implementation that we could follow?

in order to try to apply the same logic here...

Thanks!

BR,
Nelson

> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    hdmi_rx0: hdmi-rx@0 {
> > +        compatible = "snps,dw-hdmi-rx";
> > +        reg = <0x0 0x10000>;
> > +        interrupts = <1 2>;
> > +
> > +        clocks = <&dw_hdmi_refclk>;
> > +        clock-names = "cfg";
> > +
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        phys = <&hdmi_e405_phy>;
> > +        phy-names = "hdmi-phy";
> > +
> > +        hdmi_e405_phy: hdmi-phy@fc {
> > +                compatible = "snps,dw-hdmi-phy-e405";
> > +                reg = <0xfc>;
> > +
> > +                clocks = <&dw_hdmi_refclk>;
> > +                clock-names = "cfg";
> > +
> > +                #phy-cells = <0>;
> > +                input-count = <4>;
> > +        };
> > +    };
> > +  - |
> > +    hdmi_rx1: hdmi-rx@1 {
> > +        compatible = "snps,dw-hdmi-rx";
> > +        reg = <0x0 0x10000>;
> > +        interrupts = <1 2>;
> > +
> > +        clocks = <&dw_hdmi_refclk>;
> > +        clock-names = "cfg";
> > +
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        phys = <&hdmi_e406_phy>;
> > +        phy-names = "hdmi-phy";
> > +
> > +        hdmi_e406_phy: hdmi-phy@fc {
> > +                compatible = "snps,dw-hdmi-phy-e406";
> > +                reg = <0xfc>;
> > +
> > +                clocks = <&dw_hdmi_refclk>;
> > +                clock-names = "cfg";
> > +
> > +                #phy-cells = <0>;
> > +                input-count = <4>;
> > +        };
> > +    };
> 
> -- 
> Regards,
> 
> Laurent Pinchart