Hi,

On Tue, Jul 21, 2026 at 08:41:12AM +0200, Igor Paunovic wrote:
> The HDMI RX controller can expose the audio embedded in the incoming
> HDMI stream as an ALSA capture device. Document the #sound-dai-cells
> property so that a sound card can reference the HDMI RX audio DAI.
> 
> Signed-off-by: Igor Paunovic <royalnet026@gmail.com>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>

-- Sebastian

> Changes in v4 (both suggested by Krzysztof Kozlowski):
> - reference dai-common.yaml and switch additionalProperties to
>   unevaluatedProperties: false
> - drop the consumer comment from the binding example
> 
> Changes in v3:
> - no changes
> 
> Changes in v2 (all suggested by Sebastian Reichel):
> - reworded the commit message to describe the hardware
> - property description now documents the DAI indexes (0 = I2S,
>   1 = S/PDIF)
> - moved the consumer reference into the binding example
>  .../devicetree/bindings/media/snps,dw-hdmi-rx.yaml  | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> index b7f6c87..b80660d 100644
> --- a/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> +++ b/Documentation/devicetree/bindings/media/snps,dw-hdmi-rx.yaml
> @@ -78,6 +78,13 @@ properties:
>        The phandle of the syscon node for the Video Output GRF register
>        to enable EDID transfer through SDAIN and SCLIN.
>  
> +  "#sound-dai-cells":
> +    const: 1
> +    description:
> +      The HDMI RX controller has two digital audio interfaces, one for
> +      I2S and one for S/PDIF. The DAI cell selects the interface, 0 for
> +      I2S and 1 for S/PDIF.
> +
>  required:
>    - compatible
>    - reg
> @@ -90,7 +97,10 @@ required:
>    - pinctrl-0
>    - hpd-gpios
>  
> -additionalProperties: false
> +allOf:
> +  - $ref: /schemas/sound/dai-common.yaml#
> +
> +unevaluatedProperties: false
>  
>  examples:
>    - |
> @@ -129,4 +139,5 @@ examples:
>        pinctrl-0 = <&hdmim1_rx_cec &hdmim1_rx_hpdin &hdmim1_rx_scl &hdmim1_rx_sda &hdmirx_5v_detection>;
>        pinctrl-names = "default";
>        hpd-gpios = <&gpio1 22 GPIO_ACTIVE_LOW>;
> +      #sound-dai-cells = <1>;
>      };
> -- 
> 2.53.0
>