ASoC: dt-bindings: support imx95's CM7 core

Add binding for imx95's CM7 core, used for audio processing.
Additionally, introduce a common binding for NXP audio processors with
Sound Open Firmware (SOF) support.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Link: https://patch.msgid.link/20250311163255.2664-2-laurentiumihalcea111@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/fsl,imx95-cm7-sof.yaml

@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl,imx95-cm7-sof.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP imx95 CM7 core
+
+maintainers:
+  - Daniel Baluta <daniel.baluta@nxp.com>
+
+description: NXP imx95 CM7 core used for audio processing
+
+properties:
+  compatible:
+    const: fsl,imx95-cm7-sof
+
+  reg:
+    maxItems: 1
+
+  reg-names:
+    const: sram
+
+  memory-region:
+    maxItems: 1
+
+  memory-region-names:
+    const: dma
+
+  port:
+    description: SAI3 port
+    $ref: audio-graph-port.yaml#
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - memory-region
+  - memory-region-names
+  - port
+
+allOf:
+  - $ref: fsl,sof-cpu.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    cm7-cpu@80000000 {
+        compatible = "fsl,imx95-cm7-sof";
+        reg = <0x80000000 0x6100000>;
+        reg-names = "sram";
+        mboxes = <&mu7 2 0>, <&mu7 2 1>, <&mu7 3 0>, <&mu7 3 1>;
+        mbox-names = "txdb0", "txdb1", "rxdb0", "rxdb1";
+        memory-region = <&adma_res>;
+        memory-region-names = "dma";
+        port {
+            /* SAI3-WM8962 link */
+            endpoint {
+                remote-endpoint = <&wm8962_ep>;
+            };
+        };
+    };

Documentation/devicetree/bindings/sound/fsl,sof-cpu.yaml

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl,sof-cpu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP audio processor common properties
+
+maintainers:
+  - Daniel Baluta <daniel.baluta@nxp.com>
+
+properties:
+  mboxes:
+    maxItems: 4
+
+  mbox-names:
+    items:
+      - const: txdb0
+      - const: txdb1
+      - const: rxdb0
+      - const: rxdb1
+
+required:
+  - mboxes
+  - mbox-names
+
+additionalProperties: true