dt-bindings: arm: Convert Realtek board/soc bindings to json-schema

Convert Realtek SoC bindings to DT schema format using json-schema.

Andreas is the only author and we agreed in person on licensing to be
GPL2+/BSD.

Cc: "Andreas Färber" <afaerber@suse.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/realtek.txt

-Realtek platforms device tree bindings
---------------------------------------
-
-
-RTD1295 SoC
-===========
-
-Required root node properties:
-
- - compatible :  must contain "realtek,rtd1295"
-
-
-Root node property compatible must contain, depending on board:
-
- - MeLE V9: "mele,v9"
- - ProBox2 AVA: "probox2,ava"
- - Zidoo X9S: "zidoo,x9s"
-
-
-Example:
-
-    compatible = "zidoo,x9s", "realtek,rtd1295";

Documentation/devicetree/bindings/arm/realtek.yaml

+# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/realtek.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Realtek platforms device tree bindings
+
+maintainers:
+  - Andreas Färber <afaerber@suse.de>
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    # RTD1295 SoC based boards
+    items:
+      - enum:
+          - mele,v9
+          - probox2,ava
+          - zidoo,x9s
+      - const: realtek,rtd1295
+...

MAINTAINERS

@@ -2151,7 +2151,7 @@ M:	Andreas Färber <afaerber@suse.de>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm64/boot/dts/realtek/
-F:	Documentation/devicetree/bindings/arm/realtek.txt
+F:	Documentation/devicetree/bindings/arm/realtek.yaml
 
 ARM/RENESAS ARM64 ARCHITECTURE
 M:	Simon Horman <horms@verge.net.au>