dt-bindings: display: convert samsung,s6e63m0 to DT Schema

The binding for this panel is a SPI slave.

v2:
  - Drop use of spi-slave (Maxime)
  - Introude unevaluatedProperties (Maxime)
  - Drop reg entry in example (Rob)
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Jonathan Bakker <xc-racer2@live.ca>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200408195109.32692-5-sam@ravnborg.org

Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt

-Samsung s6e63m0 AMOLED LCD panel
-
-Required properties:
-  - compatible: "samsung,s6e63m0"
-  - reset-gpios: GPIO spec for reset pin
-  - vdd3-supply: VDD regulator
-  - vci-supply: VCI regulator
-
-The panel must obey rules for SPI slave device specified in document [1].
-
-The device node can contain one 'port' child node with one child
-'endpoint' node, according to the bindings defined in [2]. This
-node should describe panel's video bus.
-
-[1]: Documentation/devicetree/bindings/spi/spi-bus.txt
-[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
-
-Example:
-
-		s6e63m0: display@0 {
-			compatible = "samsung,s6e63m0";
-			reg = <0>;
-			reset-gpio = <&mp05 5 1>;
-			vdd3-supply = <&ldo12_reg>;
-			vci-supply = <&ldo11_reg>;
-			spi-max-frequency = <1200000>;
-
-			port {
-				lcd_ep: endpoint {
-					remote-endpoint = <&fimd_ep>;
-				};
-			};
-		};

Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/samsung,s6e63m0.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung s6e63m0 AMOLED LCD panel
+
+maintainers:
+  - Jonathan Bakker <xc-racer2@live.ca>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: samsung,s6e63m0
+
+  reg: true
+  reset-gpios: true
+  port: true
+
+  vdd3-supply:
+    description: VDD regulator
+
+  vci-supply:
+    description: VCI regulator
+
+required:
+  - compatible
+  - reset-gpios
+  - vdd3-supply
+  - vci-supply
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display@0 {
+            compatible = "samsung,s6e63m0";
+            reg = <0>;
+            reset-gpios = <&mp05 5 1>;
+            vdd3-supply = <&ldo12_reg>;
+            vci-supply = <&ldo11_reg>;
+            spi-max-frequency = <1200000>;
+
+            port {
+                lcd_ep: endpoint {
+                    remote-endpoint = <&fimd_ep>;
+                };
+            };
+        };
+    };
+
+...