[PATCH v2 1/5] ASoC: dt-bindings: fsl,imx-asrc: update port binding to support multiple paths

[shengjiu.wang at oss.nxp.com]

From: Shengjiu Wang <shengjiu.wang at nxp.com>

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 at 0 -- conversion path 0
  port at 1 -- conversion path 1
  port at 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. Update the examples to
show both the new ports form and the deprecated port 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.

Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
---
 .../bindings/sound/fsl,imx-asrc.yaml          | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml b/Documentation/devicetree/bindings/sound/fsl,imx-asrc.yaml
index 608defc93c1e..ecb0aacba456 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:
@@ -188,3 +202,59 @@ examples:
             };
        };
     };
+
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/imx6qdl-clock.h>
+    asrc1: asrc at 2034000 {
+        compatible = "fsl,imx53-asrc";
+        reg = <0x02034000 0x4000>;
+        interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clks IMX6QDL_CLK_ASRC_IPG>,
+                 <&clks IMX6QDL_CLK_ASRC_MEM>, <&clks 0>,
+                 <&clks 0>, <&clks 0>, <&clks 0>, <&clks 0>,
+                 <&clks 0>, <&clks 0>, <&clks 0>, <&clks 0>,
+                 <&clks 0>, <&clks 0>, <&clks 0>, <&clks 0>,
+                 <&clks IMX6QDL_CLK_ASRC>, <&clks 0>, <&clks 0>,
+                 <&clks IMX6QDL_CLK_SPBA>;
+        clock-names = "mem", "ipg", "asrck_0",
+                "asrck_1", "asrck_2", "asrck_3", "asrck_4",
+                "asrck_5", "asrck_6", "asrck_7", "asrck_8",
+                "asrck_9", "asrck_a", "asrck_b", "asrck_c",
+                "asrck_d", "asrck_e", "asrck_f", "spba";
+        dmas = <&sdma 17 23 1>, <&sdma 18 23 1>, <&sdma 19 23 1>,
+               <&sdma 20 23 1>, <&sdma 21 23 1>, <&sdma 22 23 1>;
+        dma-names = "rxa", "rxb", "rxc",
+                    "txa", "txb", "txc";
+        fsl,asrc-rate = <48000>;
+        fsl,asrc-width = <16>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port at 0 {
+                reg = <0>;
+                playback-only;
+                asrc1_endpoint0: endpoint {
+                    remote-endpoint = <&fe00_ep>;
+                };
+            };
+
+            port at 1 {
+                reg = <1>;
+                capture-only;
+                asrc1_endpoint1: endpoint {
+                    remote-endpoint = <&fe01_ep>;
+                };
+            };
+
+            port at 2 {
+                reg = <2>;
+                capture-only;
+                asrc1_endpoint2: endpoint {
+                    remote-endpoint = <&fe02_ep>;
+                };
+            };
+        };
+    };
-- 
2.34.1