linux-kernel - Re: [PATCH v7 1/7] dt-bindings: display: imx: add HDMI PAI for i.MX8MP

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Message-ID: <aPc9-wYxGB1KYPyQ@phenom.ffwll.local>
Date: Tue, 21 Oct 2025 10:02:03 +0200
From: Simona Vetter <simona.vetter@...ll.ch>
To: Shengjiu Wang <shengjiu.wang@....com>
Cc: andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org,
	Laurent.pinchart@...asonboard.com, jonas@...boo.se,
	jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
	simona@...ll.ch, lumag@...nel.org, dianders@...omium.org,
	cristian.ciocaltea@...labora.com, luca.ceresoli@...tlin.com,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	victor.liu@....com, shawnguo@...nel.org, s.hauer@...gutronix.de,
	kernel@...gutronix.de, festevam@...il.com, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, p.zabel@...gutronix.de,
	devicetree@...r.kernel.org, l.stach@...gutronix.de,
	shengjiu.wang@...il.com, perex@...ex.cz, tiwai@...e.com,
	linux-sound@...r.kernel.org
Subject: Re: [PATCH v7 1/7] dt-bindings: display: imx: add HDMI PAI for
 i.MX8MP

On Tue, Sep 23, 2025 at 01:29:55PM +0800, Shengjiu Wang wrote:
> Add binding for the i.MX8MP HDMI parallel Audio interface block.
> 
> The HDMI TX Parallel Audio Interface (HTX_PAI) is a digital module that
> acts as the bridge between the Audio Subsystem to the HDMI TX Controller.
> This IP block is found in the HDMI subsystem of the i.MX8MP SoC.
> 
> Aud2htx module in Audio Subsystem, HDMI PAI module and HDMI TX
> Controller compose the HDMI audio pipeline.
> 
> In fsl,imx8mp-hdmi-tx.yaml, add port@2 that is linked to pai_to_hdmi_tx.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Tested-by: Alexander Stein <alexander.stein@...tq-group.com>

dt patches need an ack from dt maintainers before you push them, please
make sure you follow that for the next changes.
-Sima

> ---
>  .../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@2:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Parallel audio input port
> +
>      required:
>        - port@0
>        - port@1
> @@ -98,5 +102,13 @@ examples:
>                      remote-endpoint = <&hdmi0_con>;
>                  };
>              };
> +
> +            port@2 {
> +                reg = <2>;
> +
> +                endpoint {
> +                    remote-endpoint = <&pai_to_hdmi_tx>;
> +                };
> +            };
>          };
>      };
> diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml
> new file mode 100644
> index 000000000000..4f99682a308d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8mp-hdmi-pai.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$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@....com>
> +
> +description:
> +  The HDMI TX Parallel Audio Interface (HTX_PAI) is a bridge between the
> +  Audio Subsystem to the HDMI TX Controller.
> +
> +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.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - power-domains
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mp-clock.h>
> +    #include <dt-bindings/power/imx8mp-power.h>
> +
> +    audio-bridge@...c4800 {
> +        compatible = "fsl,imx8mp-hdmi-pai";
> +        reg = <0x32fc4800 0x800>;
> +        interrupt-parent = <&irqsteer_hdmi>;
> +        interrupts = <14>;
> +        clocks = <&clk IMX8MP_CLK_HDMI_APB>;
> +        clock-names = "apb";
> +        power-domains = <&hdmi_blk_ctrl IMX8MP_HDMIBLK_PD_PAI>;
> +
> +        port {
> +            pai_to_hdmi_tx: endpoint {
> +                remote-endpoint = <&hdmi_tx_from_pai>;
> +            };
> +        };
> +    };
> -- 
> 2.34.1
> 

-- 
Simona Vetter
Software Engineer
http://blog.ffwll.ch