ASoC: add devicetree support for WM8961 codec

Merge series from Doug Brown <[e-mail]>:

This series adds devicetree support for the Wolfson WM8961 codec. The
first patch adds a schema, the second patch hooks it up in the code, and
the third patch allows it to be selected in Kconfig.

Documentation/devicetree/bindings/sound/wlf,wm8961.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/wlf,wm8961.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Wolfson WM8961 Ultra-Low Power Stereo CODEC
+
+maintainers:
+  - [e-mail]
+
+properties:
+  compatible:
+    const: wlf,wm8961
+
+  reg:
+    maxItems: 1
+
+  '#sound-dai-cells':
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - '#sound-dai-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          wm8961: codec@4a {
+                  compatible = "wlf,wm8961";
+                  reg = <0x4a>;
+                  #sound-dai-cells = <0>;
+          };
+    };

sound/soc/codecs/Kconfig

···
 	depends on I2C
 
 config SND_SOC_WM8961
-	tristate
+	tristate "Wolfson Microelectronics WM8961 CODEC"
 	depends on I2C
 
 config SND_SOC_WM8962

sound/soc/codecs/wm8961.c

···
 };
 MODULE_DEVICE_TABLE(i2c, wm8961_i2c_id);
 
+static const struct of_device_id wm8961_of_match[] __maybe_unused = {
+	{ .compatible = "wlf,wm8961", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, wm8961_of_match);
+
 static struct i2c_driver wm8961_i2c_driver = {
 	.driver = {
 		.name = "wm8961",
+		.of_match_table = of_match_ptr(wm8961_of_match),
 	},
 	.probe_new = wm8961_i2c_probe,
 	.id_table = wm8961_i2c_id,