ASoC: dt-bindings: max98396: add amplifier driver

This patch adds dt-bindings information for Analog Devices MAX98396
and MAX98397 Smart Amplifier.

Signed-off-by: Ryan Lee <ryans.lee@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220425173715.1827706-1-ryan.lee.analog@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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

@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/adi,max98396.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices MAX98396 Speaker Amplifier Device Tree Bindings
+
+maintainers:
+  - Ryan Lee <ryans.lee@analog.com>
+
+description:
+  The MAX98396 is a mono Class-DG speaker amplifier with I/V sense.
+  The device provides a PCM interface for audio data and a standard
+  I2C interface for control data communication.
+  The MAX98397 is a variant of MAX98396 with wide input supply range.
+
+properties:
+  compatible:
+    enum:
+      - adi,max98396
+      - adi,max98397
+  reg:
+    maxItems: 1
+    description: I2C address of the device.
+
+  adi,vmon-slot-no:
+    description: slot number of the voltage sense monitor
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 0
+    maximum: 15
+    default: 0
+
+  adi,imon-slot-no:
+    description: slot number of the current sense monitor
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 0
+    maximum: 15
+    default: 0
+
+  adi,spkfb-slot-no:
+    description: slot number of speaker DSP monitor
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 0
+    maximum: 15
+    default: 0
+
+  adi,interleave-mode:
+    description:
+      For cases where a single combined channel for the I/V sense data
+      is not sufficient, the device can also be configured to share
+      a single data output channel on alternating frames.
+      In this configuration, the current and voltage data will be frame
+      interleaved on a single output channel.
+    type: boolean
+
+  reset-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        max98396: amplifier@39 {
+            compatible = "adi,max98396";
+            reg = <0x39>;
+            adi,vmon-slot-no = <0>;
+            adi,imon-slot-no = <1>;
+            reset-gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+        };
+    };