ASoC: dt-bindings: irondevice,sma1307: Add initial DT

This adds the schema binding for the Iron Device SMA1307 Amp

Signed-off-by: Kiseok Jo <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/irondevice,sma1307.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/irondevice,sma1307.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Iron Device SMA1307 Audio Amplifier
+
+maintainers:
+  - Kiseok Jo <[e-mail]>
+
+description:
+  SMA1307 boosted digital speaker amplifier with feedback-loop.
+
+allOf:
+  - $ref: dai-common.yaml#
+
+properties:
+  compatible:
+    enum:
+      - irondevice,sma1307a
+      - irondevice,sma1307aq
+    description:
+      If a 'q' is added, it indicated the product is AEC-Q100
+      qualified for automotive applications. SMA1307A supports
+      both WLCSP and QFN packages. However, SMA1307AQ only
+      supports the QFN package.
+
+  reg:
+    maxItems: 1
+
+  '#sound-dai-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - '#sound-dai-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        amplifier@1e {
+            compatible = "irondevice,sma1307a";
+            reg = <0x1e>;
+            #sound-dai-cells = <1>;
+        };
+    };