ASoC: dt-bindings: Add StarFive JH7110 PWM-DAC controller

Add bindings for the PWM-DAC controller on the JH7110
RISC-V SoC by StarFive Ltd.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
Link: https://lore.kernel.org/r/20230814080618.10036-2-hal.feng@starfivetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/starfive,jh7110-pwmdac.yaml

@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/starfive,jh7110-pwmdac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7110 PWM-DAC Controller
+
+description:
+  The PWM-DAC Controller uses PWM square wave generators plus RC filters to
+  form a DAC for audio play in StarFive JH7110 SoC. This audio play controller
+  supports 16 bit audio format, up to 48K sampling frequency, up to left and
+  right dual channels.
+
+maintainers:
+  - Hal Feng <hal.feng@starfivetech.com>
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    const: starfive,jh7110-pwmdac
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: PWMDAC APB
+      - description: PWMDAC CORE
+
+  clock-names:
+    items:
+      - const: apb
+      - const: core
+
+  resets:
+    maxItems: 1
+    description: PWMDAC APB
+
+  dmas:
+    maxItems: 1
+    description: TX DMA Channel
+
+  dma-names:
+    const: tx
+
+  "#sound-dai-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - dmas
+  - dma-names
+  - "#sound-dai-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    pwmdac@100b0000 {
+        compatible = "starfive,jh7110-pwmdac";
+        reg = <0x100b0000 0x1000>;
+        clocks = <&syscrg 157>,
+                 <&syscrg 158>;
+        clock-names = "apb", "core";
+        resets = <&syscrg 96>;
+        dmas = <&dma 22>;
+        dma-names = "tx";
+        #sound-dai-cells = <0>;
+    };