ASoC: dt-bindings: Add Loongson I2S controller

Add Loongson I2S controller binding with DT schema format using
json-schema.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/91e49509f1aaa70e635b6662ed9fffaf31165799.1728459624.git.zhoubinbin@loongson.cn
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/loongson,ls2k1000-i2s.yaml

@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/loongson,ls2k1000-i2s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson-2K1000 I2S controller
+
+maintainers:
+  - Binbin Zhou <zhoubinbin@loongson.cn>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: loongson,ls2k1000-i2s
+
+  reg:
+    items:
+      - description: Loongson I2S controller Registers.
+      - description: APB DMA config register for Loongson I2S controller.
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  dmas:
+    maxItems: 2
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
+  '#sound-dai-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - dmas
+  - dma-names
+  - '#sound-dai-cells'
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/loongson,ls2k-clk.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2s@1fe2d000 {
+        compatible = "loongson,ls2k1000-i2s";
+        reg = <0x1fe2d000 0x14>,
+              <0x1fe00438 0x8>;
+        interrupt-parent = <&liointc0>;
+        interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk LOONGSON2_APB_CLK>;
+        dmas = <&apbdma2 0>, <&apbdma3 0>;
+        dma-names = "tx", "rx";
+        #sound-dai-cells = <0>;
+    };
+...