ASoC: codecs: dt bind. doc for the new TI SRC4392 codec

Signed-off-by: NMatt Flax <flatmax@flatmax.com>
Link: https://lore.kernel.org/r/20220814222218.119786-1-flatmax@flatmax.comSigned-off-by: NMark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ti,src4xxx.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/ti,src4xxx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments SRC4392 Device Tree Bindings
+
+description: |
+  The SRC4392 is a digital audio codec that can be connected via
+  I2C or SPI. Currently, only I2C bus is supported.
+
+maintainers:
+  - Matt Flax <flatmax@flatmax.com>
+
+allOf:
+  - $ref: name-prefix.yaml#
+
+properties:
+  compatible:
+    const: ti,src4392
+
+  "#sound-dai-cells":
+    const: 0
+
+  reg:
+    maxItems: 1
+
+required:
+  - "#sound-dai-cells"
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        audio-codec@70 {
+            #sound-dai-cells = <0>;
+            compatible = "ti,src4392";
+            reg = <0x70>;
+        };
+    };
+...