[PATCH v2 1/6] dt-bindings: display: imx: add HDMI PAI for i.MX8MP

[Krzysztof Kozlowski]

On Thu, Jul 24, 2025 at 03:22:43PM +0800, Shengjiu Wang wrote:
> Add binding for the i.MX8MP HDMI parallel Audio interface block.
> 
> In fsl,imx8mp-hdmi-tx.yaml, add port at 2 that linked to pai_to_hdmi_tx.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
> ---
>  .../display/bridge/fsl,imx8mp-hdmi-tx.yaml    | 12 ++++
>  .../display/imx/fsl,imx8mp-hdmi-pai.yaml      | 69 +++++++++++++++++++
>  2 files changed, 81 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml
> index 05442d437755..6211ab8bbb0e 100644
> --- a/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/fsl,imx8mp-hdmi-tx.yaml
> @@ -49,6 +49,10 @@ properties:
>          $ref: /schemas/graph.yaml#/properties/port
>          description: HDMI output port
>  
> +      port at 2:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Parallel audio input port

Which data path this represents? Feels like you are duplicating ASoC
dai-links/cells...


> +
>      required:
>        - port at 0
>        - port at 1
> @@ -98,5 +102,13 @@ examples:
>                      remote-endpoint = <&hdmi0_con>;
>                  };
>              };
> +
> +            port at 2 {
> +                reg = <2>;
> +
> +                endpoint {
> +                    remote-endpoint = <&pai_to_hdmi_tx>;
> +                };
> +            };
>          };
>      };
> diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml
> new file mode 100644
> index 000000000000..4f99682a308d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/imx/fsl,imx8mp-hdmi-pai.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX8MP HDMI Parallel Audio Interface
> +
> +maintainers:
> +  - Shengjiu Wang <shengjiu.wang at nxp.com>
> +
> +description:
> +  The HDMI TX Parallel Audio Interface (HTX_PAI) is a bridge between the
> +  Audio Subsystem to the HDMI TX Controller.

What is Audio Subsystem? Like Linux Audio or some name matching actual
hardware?


> +
> +properties:
> +  compatible:
> +    const: fsl,imx8mp-hdmi-pai
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: apb
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +    description: Output to the HDMI TX controller.

And how do you plug it into sound card? Where are any DAI links?

Best regards,
Krzysztof