dt-bindings: soc: socionext: Add UniPhier ADAMV block

Add devicetree binding schema for the ADAMV block implemented on Socionext
Uniphier SoCs.

The ADAMV block is analog signal amplifier that is a part of the external
video and audio I/O system. This block is implemented on LD11 and LD20,
and this is defined for controlling audio I/O reset only.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221213082449.2721-16-hayashi.kunihiko@socionext.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/soc/socionext/socionext,uniphier-adamv.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/socionext/socionext,uniphier-adamv.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Socionext UniPhier ADAMV block
+
+maintainers:
+  - Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
+
+description: |+
+  ADAMV block implemented on Socionext UniPhier SoCs is an analog signal
+  amplifier that is a part of the external video and audio I/O system.
+
+  This block is defined for controlling audio I/O reset only.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - socionext,uniphier-ld11-adamv
+          - socionext,uniphier-ld20-adamv
+      - const: simple-mfd
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  reset-controller:
+    $ref: /schemas/reset/socionext,uniphier-reset.yaml#
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    syscon@57920000 {
+        compatible = "socionext,uniphier-ld20-adamv",
+                     "simple-mfd", "syscon";
+        reg = <0x57920000 0x1000>;
+
+        reset-controller {
+            compatible = "socionext,uniphier-ld20-adamv-reset";
+            #reset-cells = <1>;
+        };
+    };