dt-bindings: tas2764: Add the TAS2764 binding doc

Add the binding for the TAS2764 Smart Amplifier.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20201007155341.10139-1-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/tas2764.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2020 Texas Instruments Incorporated
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/sound/tas2764.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Texas Instruments TAS2764 Smart PA
+
+maintainers:
+  - Dan Murphy <dmurphy@ti.com>
+
+description: |
+  The TAS2764 is a mono, digital input Class-D audio amplifier optimized for
+  efficiently driving high peak power into small loudspeakers.
+  Integrated speaker voltage and current sense provides for
+  real time monitoring of loudspeaker behavior.
+
+properties:
+  compatible:
+    enum:
+      - ti,tas2764
+
+  reg:
+    maxItems: 1
+    description: |
+       I2C address of the device can be between 0x38 to 0x45.
+
+  reset-gpios:
+    maxItems: 1
+    description: GPIO used to reset the device.
+
+  shutdown-gpios:
+    maxItems: 1
+    description: GPIO used to control the state of the device.
+
+  interrupts:
+    maxItems: 1
+
+  ti,imon-slot-no:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: TDM TX current sense time slot.
+
+  ti,vmon-slot-no:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: TDM TX voltage sense time slot.
+
+  '#sound-dai-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+   #include <dt-bindings/gpio/gpio.h>
+   i2c0 {
+     #address-cells = <1>;
+     #size-cells = <0>;
+     codec: codec@38 {
+       compatible = "ti,tas2764";
+       reg = <0x38>;
+       #sound-dai-cells = <1>;
+       interrupt-parent = <&gpio1>;
+       interrupts = <14>;
+       reset-gpios = <&gpio1 15 0>;
+       shutdown-gpios = <&gpio1 15 0>;
+       ti,imon-slot-no = <0>;
+       ti,vmon-slot-no = <2>;
+     };
+   };
+
+...