[PATCH v3 2/5] ASoC: dt-bindings: fsl,easrc: add ports binding for multiple conversion paths

From: Shengjiu Wang <[email protected]>

The i.MX EASRC hardware supports up to four conversion contexts
(A, B, C, D). Add a ports container property to the binding to allow
each independent conversion path to be represented as an individual
audio-graph port:

  port@0 -- conversion path 0
  port@1 -- conversion path 1
  port@2 -- conversion path 2
  port@3 -- conversion path 3

Each sub-port references audio-graph-port.yaml and follows the standard
audio-graph binding conventions. Contexts are allocated dynamically at
stream open time; each active stream direction (playback or capture) on
a port consumes one hardware context.

Signed-off-by: Shengjiu Wang <[email protected]>
---
 .../devicetree/bindings/sound/fsl,easrc.yaml  | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/fsl,easrc.yaml b/Documentation/devicetree/bindings/sound/fsl,easrc.yaml
index d5727f8bfb0b..a53ec4f6f1c0 100644
--- a/Documentation/devicetree/bindings/sound/fsl,easrc.yaml
+++ b/Documentation/devicetree/bindings/sound/fsl,easrc.yaml
@@ -55,6 +55,14 @@ properties:
       - const: imx/easrc/easrc-imx8mn.bin
     description: The coefficient table for the filters
 
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    patternProperties:
+      "^port@[0-3]$":
+        $ref: audio-graph-port.yaml#
+        unevaluatedProperties: false
+        description: port for an independent conversion path
+
   fsl,asrc-rate:
     $ref: /schemas/types.yaml#/definitions/uint32
     minimum: 8000
@@ -106,4 +114,41 @@ examples:
         firmware-name = "imx/easrc/easrc-imx8mn.bin";
         fsl,asrc-rate = <8000>;
         fsl,asrc-format = <2>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                playback-only;
+                endpoint {
+                    remote-endpoint = <&fe00_ep>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                playback-only;
+                endpoint {
+                    remote-endpoint = <&fe01_ep>;
+                };
+            };
+
+            port@2 {
+                reg = <2>;
+                capture-only;
+                endpoint {
+                    remote-endpoint = <&fe02_ep>;
+                };
+            };
+
+            port@3 {
+                reg = <3>;
+                capture-only;
+                endpoint {
+                    remote-endpoint = <&fe03_ep>;
+                };
+            };
+        };
     };
-- 
2.34.1