ASoC: dt-bindings: add bindings for TI TAS5805M.

The TAS5805M is a class D speaker amplifier with integrated DSP.
Configuration must be generated by TI's PPC3 tool and supplied as a
firmware image.
Signed-off-by: Daniel Beer <daniel.beer@igorinstitute.com>
Link: https://lore.kernel.org/r/e271d381dcf1c6036a2a22bab6ab72654455aa58.1642298336.git.daniel.beer@igorinstitute.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/tas5805m.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/tas5805m.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TAS5805M audio amplifier
+
+maintainers:
+  - Daniel Beer <daniel.beer@igorinstitute.com>
+
+description: |
+  The TAS5805M is a class D audio amplifier with a built-in DSP.
+
+properties:
+  compatible:
+    enum:
+      - ti,tas5805m
+
+  reg:
+    maxItems: 1
+    description: |
+      I2C address of the amplifier. See the datasheet for possible values.
+
+  pvdd-supply:
+    description: |
+      Regulator for audio power supply (PVDD in the datasheet).
+
+  pdn-gpios:
+    description: |
+      Power-down control GPIO (PDN pin in the datasheet).
+
+  ti,dsp-config-name:
+    description: |
+      The name of the DSP configuration that should be loaded for this
+      instance. Configuration blobs are sequences of register writes
+      generated from TI's PPC3 tool.
+    $ref: /schemas/types.yaml#/definitions/string
+
+examples:
+  - |
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        tas5805m: tas5805m@2c {
+                reg = <0x2c>;
+                compatible = "ti,tas5805m";
+
+                pvdd-supply = <&audiopwr>;
+                pdn-gpios = <&tlmm 160 0>;
+
+                ti,dsp-config-name = "mono_pbtl_48khz";
+        };
+    };
+
+additionalProperties: true