[PATCH v2 2/5] ASoC: dt-bindings: fsl,easrc: add ports binding for multiple conversion paths

[shengjiu . wang]

From: Shengjiu Wang <shengjiu.wang@xxxxxxx>

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 <shengjiu.wang@xxxxxxx>
---
 .../devicetree/bindings/sound/fsl,easrc.yaml  | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/fsl,easrc.yaml b/Documentation/devicetree/bindings/sound/fsl,easrc.yaml
index d5727f8bfb0b..e6d7cae5983d 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
@@ -107,3 +115,63 @@ examples:
         fsl,asrc-rate = <8000>;
         fsl,asrc-format = <2>;
     };
+
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/imx8mn-clock.h>
+
+    easrc1: easrc@300c0000 {
+        compatible = "fsl,imx8mn-easrc";
+        reg = <0x300c0000 0x10000>;
+        interrupts = <GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk IMX8MN_CLK_ASRC_ROOT>;
+        clock-names = "mem";
+        dmas = <&sdma2 16 23 0> , <&sdma2 17 23 0>,
+               <&sdma2 18 23 0> , <&sdma2 19 23 0>,
+               <&sdma2 20 23 0> , <&sdma2 21 23 0>,
+               <&sdma2 22 23 0> , <&sdma2 23 23 0>;
+        dma-names = "ctx0_rx", "ctx0_tx",
+                    "ctx1_rx", "ctx1_tx",
+                    "ctx2_rx", "ctx2_tx",
+                    "ctx3_rx", "ctx3_tx";
+        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;
+                easrc1_endpoint0: endpoint {
+                    remote-endpoint = <&fe00_ep>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                playback-only;
+                easrc1_endpoint1: endpoint {
+                    remote-endpoint = <&fe01_ep>;
+                };
+            };
+
+            port@2 {
+                reg = <2>;
+                capture-only;
+                easrc1_endpoint2: endpoint {
+                    remote-endpoint = <&fe02_ep>;
+                };
+            };
+
+            port@3 {
+                reg = <3>;
+                capture-only;
+                easrc1_endpoint3: endpoint {
+                    remote-endpoint = <&fe03_ep>;
+                };
+            };
+        };
+    };
-- 
2.34.1