linux-kernel - Re: [PATCH v7 1/3] dt-bindings: drm/bridge: Document Cadence MHDP bridge bindings

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Date:   Thu, 23 Jul 2020 09:33:26 -0600
From:   Rob Herring <robh@...nel.org>
To:     Swapnil Jakhade <sjakhade@...ence.com>
Cc:     airlied@...ux.ie, daniel@...ll.ch,
        Laurent.pinchart@...asonboard.com, a.hajda@...sung.com,
        narmstrong@...libre.com, jonas@...boo.se, jernej.skrabec@...l.net,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, mparab@...ence.com,
        yamonkar@...ence.com, tomi.valkeinen@...com, jsarha@...com,
        nsekhar@...com, praneeth@...com
Subject: Re: [PATCH v7 1/3] dt-bindings: drm/bridge: Document Cadence MHDP
 bridge bindings

On Wed, Jul 22, 2020 at 09:40:38AM +0200, Swapnil Jakhade wrote:
> From: Yuti Amonkar <yamonkar@...ence.com>
> 
> Document the bindings used for the Cadence MHDP DPI/DP bridge in
> yaml format.
> 
> Signed-off-by: Yuti Amonkar <yamonkar@...ence.com>
> Signed-off-by: Swapnil Jakhade <sjakhade@...ence.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
>  .../bindings/display/bridge/cdns,mhdp.yaml    | 127 ++++++++++++++++++
>  1 file changed, 127 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/cdns,mhdp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp.yaml
> new file mode 100644
> index 000000000000..cdf5760d4ec5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp.yaml
> @@ -0,0 +1,127 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/display/bridge/cdns,mhdp.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Cadence MHDP bridge
> +
> +maintainers:
> +  - Swapnil Jakhade <sjakhade@...ence.com>
> +  - Yuti Amonkar <yamonkar@...ence.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - cdns,mhdp8546
> +      - ti,j721e-mhdp8546
> +
> +  reg:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - description:
> +          Register block of mhdptx apb registers up to PHY mapped area (AUX_CONFIG_P).
> +          The AUX and PMA registers are not part of this range, they are instead
> +          included in the associated PHY.
> +      - description:
> +          Register block for DSS_EDP0_INTG_CFG_VP registers in case of TI J7 SoCs.
> +
> +  reg-names:
> +    minItems: 1
> +    maxItems: 2
> +    items:
> +      - const: mhdptx
> +      - const: j721e-intg
> +
> +  clocks:
> +    maxItems: 1
> +    description:
> +      DP bridge clock, used by the IP to know how to translate a number of
> +      clock cycles into a time (which is used to comply with DP standard timings
> +      and delays).
> +
> +  phys:

maxItems: 1

> +    description:
> +      phandle to the DisplayPort PHY.
> +
> +  ports:
> +    type: object
> +    description:
> +      Ports as described in Documentation/devicetree/bindings/graph.txt.
> +
> +    properties:
> +      '#address-cells':
> +        const: 1
> +
> +      '#size-cells':
> +        const: 0
> +
> +      port@0:
> +        type: object
> +        description:
> +          Input port representing the DP bridge input.
> +
> +      port@1:
> +        type: object
> +        description:
> +          Output port representing the DP bridge output.
> +
> +    required:
> +      - port@0
> +      - port@1
> +      - '#address-cells'
> +      - '#size-cells'
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: ti,j721e-mhdp8546
> +    then:
> +      properties:
> +        reg:
> +          minItems: 2
> +        reg-names:
> +          minItems: 2

else:
  properties:
    reg:
      maxItems: 1
    reg-names:
      maxItems: 1

> +
> +required:
> +  - compatible
> +  - clocks
> +  - reg
> +  - reg-names
> +  - phys
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    mhdp: dp-bridge@...b000000 {
> +        compatible = "cdns,mhdp8546";
> +        reg = <0xf0 0xfb000000 0x0 0x1000000>;
> +        reg-names = "mhdptx";
> +        clocks = <&mhdp_clock>;
> +        phys = <&dp_phy>;
> +
> +        ports {
> +              #address-cells = <1>;
> +              #size-cells = <0>;
> +
> +              port@0 {
> +                     reg = <0>;
> +                     dp_bridge_input: endpoint {
> +                        remote-endpoint = <&xxx_dpi_output>;
> +                     };
> +              };
> +
> +              port@1 {
> +                     reg = <1>;
> +                     dp_bridge_output: endpoint {
> +                        remote-endpoint = <&xxx_dp_connector_input>;
> +                     };
> +              };
> +        };
> +    };
> +...
> -- 
> 2.26.1
>