[PATCH v2 1/2] ASoC: dt-bindings: rt9120: Add initial bindings

[cy_huang]

From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>

Add initial bindings for Richtek rt9120 audio amplifier.

Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
---
Very appoligized. I forget to migrate this line from my test 5.10 kernel.
Without this line will cause sound card codec link fail.
Please use the patch v2 to review the bindings and source code.

V2
- Add missing #sound-dai-cells property.

---
 .../devicetree/bindings/sound/richtek,rt9120.yaml  | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/richtek,rt9120.yaml

diff --git a/Documentation/devicetree/bindings/sound/richtek,rt9120.yaml b/Documentation/devicetree/bindings/sound/richtek,rt9120.yaml
new file mode 100644
index 00000000..6d16795
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/richtek,rt9120.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/richtek,rt9120.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Richtek RT9120 Class-D audio amplifier
+
+maintainers:
+  - ChiYuan Huang <cy_huang@xxxxxxxxxxx>
+
+description: |
+  The RT9120 is a high efficiency, I2S-input, stereo audio power amplifier
+  delivering 2*20W into 8 Ohm BTL speaker loads. It supports the wide input
+  voltage  range from 4.5V to 26.4V to meet the need on most common
+  applications like as TV, monitors. home entertainment, electronic music
+  equipment.
+
+properties:
+  compatible:
+    enum:
+      - richtek,rt9120
+
+  reg:
+    description: I2C device address
+    maxItems: 1
+
+  pwdnn-gpios:
+    description: GPIO used for power down, low active
+    maxItems: 1
+
+  richtek,use-dvdd-1p8v:
+    description: Indicate DVDD 1P8V is used, default for 3P3V or 5V design
+    type: boolean
+
+  '#sound-dai-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - '#sound-dai-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      rt9120@1a {
+        compatible = "richtek,rt9120";
+        reg = <0x1a>;
+        #sound-dai-cells = <0>;
+        pwdnn-gpios = <&gpio26 2 0>;
+        richtek,use-dvdd-1p8v;
+      };
+    };
-- 
2.7.4