ASoC: dt-bindings: max98396: add voltage supplies

The device is supplied with 3 core voltages (DVVDIO, DVDD, AVDD), and
PVDD and/or VBAT.
Signed-off-by: Daniel Mack <daniel@zonque.org>
Link: https://lore.kernel.org/r/20220624104712.1934484-2-daniel@zonque.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/adi,max98396.yaml

@@ -24,6 +24,21 @@ properties:
     maxItems: 1
     description: I2C address of the device.
 
+  avdd-supply:
+    description: A 1.8V supply that powers up the AVDD pin.
+
+  dvdd-supply:
+    description: A 1.2V supply that powers up the DVDD pin.
+
+  dvddio-supply:
+    description: A 1.2V or 1.8V supply that powers up the VDDIO pin.
+
+  pvdd-supply:
+    description: A 3.0V to 20V supply that powers up the PVDD pin.
+
+  vbat-supply:
+    description: A 3.3V to 5.5V supply that powers up the VBAT pin.
+
   adi,vmon-slot-no:
     description: slot number of the voltage sense monitor
     $ref: "/schemas/types.yaml#/definitions/uint32"
@@ -72,6 +87,10 @@ examples:
         max98396: amplifier@39 {
             compatible = "adi,max98396";
             reg = <0x39>;
+            dvdd-supply = <&regulator_1v2>;
+            dvddio-supply = <&regulator_1v8>;
+            avdd-supply = <&regulator_1v8>;
+            pvdd-supply = <&regulator_pvdd>;
             adi,vmon-slot-no = <0>;
             adi,imon-slot-no = <1>;
             reset-gpios = <&gpio 4 GPIO_ACTIVE_LOW>;