ASoC: dt-bindings: Add Loongson-1 AC97 Controller

Add devicetree binding document for Loongson-1 AC97 controller.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
Link: https://patch.msgid.link/20250409-loongson1-ac97-v2-1-65d5db96a046@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/loongson,ls1b-ac97.yaml

@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/loongson,ls1b-ac97.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson-1 AC97 Controller
+
+maintainers:
+  - Keguang Zhang <keguang.zhang@gmail.com>
+
+description:
+  The Loongson-1 AC97 controller supports 2-channel stereo output and input.
+  It is paired with the DMA engine to handle playback and capture functions.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - const: loongson,ls1b-ac97
+      - items:
+          - enum:
+              - loongson,ls1a-ac97
+              - loongson,ls1c-ac97
+          - const: loongson,ls1b-ac97
+
+  reg:
+    maxItems: 3
+
+  reg-names:
+    items:
+      - const: ac97
+      - const: audio-tx
+      - const: audio-rx
+
+  dmas:
+    maxItems: 2
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
+  '#sound-dai-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - dmas
+  - dma-names
+  - '#sound-dai-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    audio-controller@1fe74000 {
+        compatible = "loongson,ls1b-ac97";
+        reg = <0x1fe74000 0x60>, <0x1fe72420 0x4>, <0x1fe74c4c 0x4>;
+        reg-names = "ac97", "audio-tx", "audio-rx";
+        dmas = <&dma 1>, <&dma 2>;
+        dma-names = "tx", "rx";
+        #sound-dai-cells = <0>;
+    };