Re: [PATCH v3 1/5] ASoC: dt-bindings: fsl,imx-asrc: update port binding to support multiple paths

[Frank Li]

On Tue, Aug 04, 2026 at 06:02:14PM +0800, shengjiu.wang@xxxxxxxxxxx wrote:
> From: Shengjiu Wang <shengjiu.wang@xxxxxxx>
>
> The i.MX ASRC hardware supports up to three conversion pairs (A, B, C).
> The existing binding exposed only a single generic audio-graph port,
> which cannot represent independent conversion paths when multiple pairs
> are in use simultaneously.
>
> Add a ports container that enumerates up to three sub-ports, each
> representing an independent conversion path:
>   port@0 -- conversion path 0
>   port@1 -- conversion path 1
>   port@2 -- conversion path 2
>
> Each sub-port references audio-graph-port.yaml as before. Hardware pairs
> are allocated dynamically at stream open time; each active stream
> direction (playback or capture) on a port consumes one hardware pair.
>
> For backwards compatibility, keep the old single port property but mark
> it deprecated. A schema constraint (not: required: [port, ports]) ensures
> that both forms cannot be used at the same time. The binding example is
> updated to show the preferred ports form.
>
> No existing upstream DTS file for fsl,imx-asrc uses the previously
> documented single 'port' node, so this change does not break any
> in-tree device tree.

if no existing upstream DTS file use it, you can direct replace with ports

Frank

>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
> ---
>  .../bindings/sound/fsl,imx-asrc.yaml          | 45 ++++++++++++++++---
>  1 file changed, 40 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml b/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml
> index 608defc93c1e..67d2826eef3f 100644
> --- a/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml
> +++ b/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml
> @@ -78,9 +78,19 @@ properties:
>    power-domains:
>      maxItems: 1
>
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    patternProperties:
> +      "^port@[0-2]$":
> +        $ref: audio-graph-port.yaml#
> +        unevaluatedProperties: false
> +        description: port for an independent conversion path
> +
>    port:
>      $ref: audio-graph-port.yaml#
>      unevaluatedProperties: false
> +    deprecated: true
> +    description: deprecated, use ports instead
>
>    fsl,asrc-rate:
>      $ref: /schemas/types.yaml#/definitions/uint32
> @@ -125,6 +135,10 @@ required:
>    - fsl,asrc-width
>
>  allOf:
> +  - not:
> +      required:
> +        - port
> +        - ports
>    - $ref: dai-common.yaml#
>    - if:
>        properties:
> @@ -180,11 +194,32 @@ examples:
>          fsl,asrc-rate = <48000>;
>          fsl,asrc-width = <16>;
>
> -        port {
> -            playback-only;
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +                playback-only;
> +                endpoint {
> +                    remote-endpoint = <&fe00_ep>;
> +                };
> +            };
> +
> +            port@1 {
> +                reg = <1>;
> +                capture-only;
> +                endpoint {
> +                    remote-endpoint = <&fe01_ep>;
> +                };
> +            };
>
> -            asrc_endpoint: endpoint {
> -                remote-endpoint = <&fe00_ep>;
> +            port@2 {
> +                reg = <2>;
> +                capture-only;
> +                endpoint {
> +                    remote-endpoint = <&fe02_ep>;
> +                };
>              };
> -       };
> +        };
>      };
> --
> 2.34.1
>
>