dt-bindings: display: add visionox rm69299 panel variant

Add bindings for visionox rm69299 panel.
Signed-off-by: Harigovindan P <harigovi@codeaurora.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
[fixed indent]
Link: https://patchwork.freedesktop.org/patch/msgid/20200327073636.13823-2-harigovi@codeaurora.org

Documentation/devicetree/bindings/display/panel/visionox,rm69299.yaml

+# SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/visionox,rm69299.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Visionox model RM69299 Panels Device Tree Bindings.
+
+maintainers:
+ - Harigovindan P <harigovi@codeaurora.org>
+
+description: |
+  This binding is for display panels using a Visionox RM692999 panel.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: visionox,rm69299-1080p-display
+
+  vdda-supply:
+    description: |
+      Phandle of the regulator that provides the vdda supply voltage.
+
+  vdd3p3-supply:
+    description: |
+      Phandle of the regulator that provides the vdd3p3 supply voltage.
+
+  port: true
+  reset-gpios: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - vdda-supply
+  - vdd3p3-supply
+  - reset-gpios
+  - port
+
+examples:
+  - |
+    panel {
+        compatible = "visionox,rm69299-1080p-display";
+
+        vdda-supply = <&src_pp1800_l8c>;
+        vdd3p3-supply = <&src_pp2800_l18a>;
+
+        reset-gpios = <&pm6150l_gpio 3 0>;
+        port {
+            panel0_in: endpoint {
+                remote-endpoint = <&dsi0_out>;
+            };
+        };
+    };
+...