ASoC: fsl_audmix: support audio graph card for audmix

Merge series from Shengjiu Wang <[e-mail]>:

Change 'dais' property to be optional, that fsl_audmix device can be
linked with SAI device by audio graph card.

Documentation/devicetree/bindings/sound/fsl,audmix.yaml

···
       - description: serial audio input 2
         maxItems: 1
 
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    patternProperties:
+      '^port@[0-1]':
+        $ref: audio-graph-port.yaml#
+        unevaluatedProperties: false
+        description: Input port from SAI TX
+
+    properties:
+      port@2:
+        $ref: audio-graph-port.yaml#
+        unevaluatedProperties: false
+        description: Output port to SAI RX
+
 required:
   - compatible
   - reg
   - clocks
   - clock-names
   - power-domains
-  - dais
 
 unevaluatedProperties: false
 
···
       clock-names = "ipg";
       power-domains = <&pd_audmix>;
       dais = <&sai4>, <&sai5>;
+
+      ports {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        port@0 {
+          reg = <0>;
+          playback-only;
+
+          amix_endpoint0: endpoint {
+            dai-tdm-slot-num = <8>;
+            dai-tdm-slot-width = <32>;
+            dai-tdm-slot-width-map = <32 8 32>;
+            dai-format = "dsp_a";
+            remote-endpoint = <&be00_ep>;
+          };
+        };
+
+        port@1 {
+          reg = <1>;
+          playback-only;
+
+          amix_endpoint1: endpoint {
+            dai-tdm-slot-num = <8>;
+            dai-tdm-slot-width = <32>;
+            dai-tdm-slot-width-map = <32 8 32>;
+            dai-format = "dsp_a";
+            remote-endpoint = <&be01_ep>;
+          };
+        };
+
+        port@2 {
+          reg = <2>;
+          capture-only;
+
+          amix_endpoint2: endpoint {
+            dai-tdm-slot-num = <8>;
+            dai-tdm-slot-width = <32>;
+            dai-tdm-slot-width-map = <32 8 32>;
+            dai-format = "dsp_a";
+            bitclock-master;
+            frame-master;
+            remote-endpoint = <&be02_ep>;
+          };
+        };
+      };
     };

Documentation/devicetree/bindings/sound/fsl,sai.yaml

···
     items:
       - description: receive and transmit interrupt
 
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    properties:
+      port@0:
+        $ref: audio-graph-port.yaml#
+        unevaluatedProperties: false
+        description: port for TX and RX
+
+      port@1:
+        $ref: audio-graph-port.yaml#
+        unevaluatedProperties: false
+        description: port for TX only
+
+      port@2:
+        $ref: audio-graph-port.yaml#
+        unevaluatedProperties: false
+        description: port for RX only
+
   big-endian:
     description: |
       required if all the SAI registers are big-endian rather than little-endian.
···
         dma-names = "rx", "tx";
         fsl,dataline = <1 0xff 0xff 2 0xff 0x11>;
         #sound-dai-cells = <0>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@1 {
+                reg = <1>;
+                playback-only;
+
+                sai1_endpoint0: endpoint {
+                   dai-tdm-slot-num = <8>;
+                   dai-tdm-slot-width = <32>;
+                   dai-tdm-slot-width-map = <32 8 32>;
+                   dai-format = "dsp_a";
+                   bitclock-master;
+                   frame-master;
+                   remote-endpoint = <&mcodec01_ep>;
+                };
+            };
+
+            port@2 {
+                reg = <2>;
+                capture-only;
+
+                sai1_endpoint1: endpoint {
+                    dai-tdm-slot-num = <8>;
+                    dai-tdm-slot-width = <32>;
+                    dai-tdm-slot-width-map = <32 8 32>;
+                    dai-format = "dsp_a";
+                    remote-endpoint = <&fe02_ep>;
+                };
+            };
+        };
     };

sound/soc/fsl/fsl_audmix.c

···
 		goto err_disable_pm;
 	}
 
-	priv->pdev = platform_device_register_data(dev, "imx-audmix", 0, NULL, 0);
-	if (IS_ERR(priv->pdev)) {
-		ret = PTR_ERR(priv->pdev);
-		dev_err(dev, "failed to register platform: %d\n", ret);
-		goto err_disable_pm;
+	/*
+	 * If dais property exist, then register the imx-audmix card driver.
+	 * otherwise, it should be linked by audio graph card.
+	 */
+	if (of_find_property(pdev->dev.of_node, "dais", NULL)) {
+		priv->pdev = platform_device_register_data(dev, "imx-audmix", 0, NULL, 0);
+		if (IS_ERR(priv->pdev)) {
+			ret = PTR_ERR(priv->pdev);
+			dev_err(dev, "failed to register platform: %d\n", ret);
+			goto err_disable_pm;
+		}
 	}
 
 	return 0;