linux-kernel - Re: [PATCH v6 2/8] dt-bindings: display: bridge: Add Cadence MHDP8501 HDMI and DP

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Message-ID: <20230620154856.GB3637514-robh@kernel.org>
Date:   Tue, 20 Jun 2023 09:48:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sandor Yu <Sandor.yu@....com>
Cc:     andrzej.hajda@...el.com, neil.armstrong@...aro.org,
        robert.foss@...aro.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com,
        daniel@...ll.ch, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        vkoul@...nel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        kernel@...gutronix.de, linux-imx@....com, oliver.brown@....com
Subject: Re: [PATCH v6 2/8] dt-bindings: display: bridge: Add Cadence
 MHDP8501 HDMI and DP

On Thu, Jun 15, 2023 at 09:38:12AM +0800, Sandor Yu wrote:
> Add bindings for Cadence MHDP8501 DisplayPort and HDMI driver.

Bindings are for h/w, not a driver.

> 
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> ---
>  .../display/bridge/cdns,mhdp8501.yaml         | 105 ++++++++++++++++++
>  1 file changed, 105 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/cdns,mhdp8501.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8501.yaml b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8501.yaml
> new file mode 100644
> index 000000000000..a54756815e6f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp8501.yaml
> @@ -0,0 +1,105 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/cdns,mhdp8501.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cadence MHDP8501 Displayport bridge
> +
> +maintainers:
> +  - Sandor Yu <Sandor.yu@....com>
> +
> +description:
> +  The Cadence MHDP8501 Displayport/HDMI TX interface.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - cdns,mhdp8501-dp
> +      - cdns,mhdp8501-hdmi
> +      - fsl,imx8mq-mhdp8501-dp
> +      - fsl,imx8mq-mhdp8501-hdmi

Is DP vs. HDMI fixed for a particular SoC implementation or it's a board 
level decision. In the latter case, the type of connector should 
determine the mode, not compatible.

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +    description: MHDP8501 DP/HDMI APB clock.

Seems odd there's no clock tied to the pixel/serdes clock.

> +
> +  phys:
> +    maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: Hotplug cable plugin.
> +      - description: Hotplug cable plugout.
> +
> +  interrupt-names:
> +    items:
> +      - const: plug_in
> +      - const: plug_out
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          Input port from display controller output.
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          Output port to DP/HDMI connector.
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - interrupts
> +  - interrupt-names
> +  - phys
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mq-clock.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    mhdp_dp: dp-bridge@...00000 {
> +        compatible = "fsl,imx8mq-mhdp8501-dp";
> +        reg = <0x32c00000 0x100000>;
> +        interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>,
> +                     <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
> +        interrupt-names = "plug_in", "plug_out";
> +        clocks = <&clk IMX8MQ_CLK_DISP_APB_ROOT>;
> +        phys = <&dp_phy>;
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +
> +                mhdp_in: endpoint {
> +                    remote-endpoint = <&dcss_out>;
> +                };
> +            };
> +
> +            port@1 {
> +                reg = <1>;
> +
> +                mhdp_out: endpoint {
> +                    remote-endpoint = <&dp_con>;
> +                };
> +            };
> +        };
> +    };
> -- 
> 2.34.1
>