ASoC: add support for TAS5805M digital amplifier

Merge series from Daniel Beer <daniel.beer@igorinstitute.com>:

This pair of patches implements support for the TAS5805M class D audio
amplifier. This driver, and the example configuration in the device-tree
file, were originally based on a 4.19 series kernel and have been
modified slightly from the tested version.

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

sound/soc/codecs/Kconfig

@@ -1485,6 +1485,15 @@ config SND_SOC_TAS5720
 	  Enable support for Texas Instruments TAS5720L/M high-efficiency mono
 	  Class-D audio power amplifiers.
 
+config SND_SOC_TAS5805M
+	tristate "Texas Instruments TAS5805M speaker amplifier"
+	depends on I2C
+	help
+	  Enable support for Texas Instruments TAS5805M Class-D
+	  amplifiers. This is a speaker amplifier with an integrated
+	  DSP. DSP configuration for each instance needs to be supplied
+	  via a device-tree attribute.
+
 config SND_SOC_TAS6424
 	tristate "Texas Instruments TAS6424 Quad-Channel Audio amplifier"
 	depends on I2C

sound/soc/codecs/Makefile

@@ -236,6 +236,7 @@ snd-soc-sti-sas-objs := sti-sas.o
 snd-soc-tas5086-objs := tas5086.o
 snd-soc-tas571x-objs := tas571x.o
 snd-soc-tas5720-objs := tas5720.o
+snd-soc-tas5805m-objs := tas5805m.o
 snd-soc-tas6424-objs := tas6424.o
 snd-soc-tda7419-objs := tda7419.o
 snd-soc-tas2770-objs := tas2770.o
@@ -574,6 +575,7 @@ obj-$(CONFIG_SND_SOC_TAS2764)	+= snd-soc-tas2764.o
 obj-$(CONFIG_SND_SOC_TAS5086)	+= snd-soc-tas5086.o
 obj-$(CONFIG_SND_SOC_TAS571X)	+= snd-soc-tas571x.o
 obj-$(CONFIG_SND_SOC_TAS5720)	+= snd-soc-tas5720.o
+obj-$(CONFIG_SND_SOC_TAS5805M)	+= snd-soc-tas5805m.o
 obj-$(CONFIG_SND_SOC_TAS6424)	+= snd-soc-tas6424.o
 obj-$(CONFIG_SND_SOC_TDA7419)	+= snd-soc-tda7419.o
 obj-$(CONFIG_SND_SOC_TAS2770) += snd-soc-tas2770.o