dt-bindings: display: convert arm,versatile-tft-panel to DT Schema

v2:
  - Fix entry in MAINTAINERS
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200408195109.32692-6-sam@ravnborg.org

Documentation/devicetree/bindings/display/panel/arm,versatile-tft-panel.txt

-ARM Versatile TFT Panels
-
-These panels are connected to the daughterboards found on the
-ARM Versatile reference designs.
-
-This device node must appear as a child to a "syscon"-compatible
-node.
-
-Required properties:
-- compatible: should be "arm,versatile-tft-panel"
-
-Required subnodes:
-- port: see display/panel/panel-common.yaml, graph.txt
-
-
-Example:
-
-sysreg@0 {
-	compatible = "arm,versatile-sysreg", "syscon", "simple-mfd";
-	reg = <0x00000 0x1000>;
-
-	panel: display@0 {
-		compatible = "arm,versatile-tft-panel";
-
-		port {
-			panel_in: endpoint {
-				remote-endpoint = <&foo>;
-			};
-		};
-	};
-};

Documentation/devicetree/bindings/display/panel/arm,versatile-tft-panel.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/arm,versatile-tft-panel.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Versatile TFT Panels
+
+maintainers:
+  - Linus Walleij <linus.walleij@linaro.org>
+
+description: |
+  These panels are connected to the daughterboards found on the
+  ARM Versatile reference designs.
+
+  This device node must appear as a child to a "syscon"-compatible
+  node.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: arm,versatile-tft-panel
+
+  port: true
+
+required:
+  - compatible
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    sysreg {
+        compatible = "arm,versatile-sysreg", "syscon", "simple-mfd";
+        reg = <0x00000 0x1000>;
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel {
+            compatible = "arm,versatile-tft-panel";
+
+            port {
+                panel_in: endpoint {
+                    remote-endpoint = <&foo>;
+                };
+            };
+        };
+    };
+
+...

MAINTAINERS

@@ -5229,7 +5229,7 @@ M:	Linus Walleij <linus.walleij@linaro.org>
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 S:	Maintained
 F:	drivers/gpu/drm/panel/panel-arm-versatile.c
-F:	Documentation/devicetree/bindings/display/panel/arm,versatile-tft-panel.txt
+F:	Documentation/devicetree/bindings/display/panel/arm,versatile-tft-panel.yaml
 
 DRM DRIVER FOR AST SERVER GRAPHICS CHIPS
 M:	Dave Airlie <airlied@redhat.com>