dt-bindings: display: panel: Add Raydium RM692E5

Raydium RM692E5 is a display driver IC used to drive AMOLED DSI panels.
Describe it.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230927-topic-fp5_disp-v2-1-7b5e1d1662a6@linaro.org

Documentation/devicetree/bindings/display/panel/raydium,rm692e5.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/raydium,rm692e5.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Raydium RM692E5 based DSI display panels
+
+maintainers:
+  - Konrad Dybcio <konradybcio@kernel.org>
+
+description:
+  The Raydium RM692E5 is a generic DSI Panel IC used to control
+  AMOLED panels.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: fairphone,fp5-rm692e5-boe
+      - const: raydium,rm692e5
+
+  dvdd-supply:
+    description: Digital voltage rail
+
+  vci-supply:
+    description: Analog voltage rail
+
+  vddio-supply:
+    description: I/O voltage rail
+
+  reg: true
+  port: true
+
+required:
+  - compatible
+  - reg
+  - reset-gpios
+  - dvdd-supply
+  - vci-supply
+  - vddio-supply
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "fairphone,fp5-rm692e5-boe", "raydium,rm692e5";
+            reg = <0>;
+
+            reset-gpios = <&tlmm 44 GPIO_ACTIVE_LOW>;
+            dvdd-supply = <&vreg_oled_vci>;
+            vci-supply = <&vreg_l12c>;
+            vddio-supply = <&vreg_oled_dvdd>;
+
+            port {
+                panel_in_0: endpoint {
+                    remote-endpoint = <&dsi0_out>;
+                };
+            };
+        };
+    };
+
+...