dt-bindings: display: panel: add Ilitek ILI7807S panel controller

ILI7807S is a DSI display controller used to drive MIPI-DSI panels.
The DLC DLC0697 1080x1920 LCD panel is based on this controller.

The panel requires a reset GPIO, I/O voltage supply (vddi), positive
LCD bias supply (avdd) and negative LCD bias supply (avee). The panel
operates in video burst mode with four data lanes using RGB888 pixel
format.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Arpit Saini <arpit.saini@oss.qualcomm.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260701-ili7807s-v4-1-c7d76d4780a5@oss.qualcomm.com

diff --git a/Documentation/devicetree/bindings/display/panel/ilitek,ili7807s.yaml b/Documentation/devicetree/bindings/display/panel/ilitek,ili7807s.yaml
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/ilitek,ili7807s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ilitek ILI7807S-based DSI panels
+
+maintainers:
+  - Arpit Saini <arpit.saini@oss.qualcomm.com>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - dlc,dlc0697
+      - const: ilitek,ili7807s
+
+  reg:
+    maxItems: 1
+    description: DSI virtual channel
+
+  vddi-supply:
+    description: I/O voltage supply (1.8V)
+
+  avdd-supply:
+    description: Positive LCD bias supply (AVDD), typically +5.5V
+      (range 4.5V to 6.3V)
+
+  avee-supply:
+    description: Negative LCD bias supply (AVEE), typically -5.5V
+      (range -6.3V to -4.5V)
+
+required:
+  - compatible
+  - reg
+  - reset-gpios
+  - vddi-supply
+  - avdd-supply
+  - avee-supply
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "dlc,dlc0697", "ilitek,ili7807s";
+            reg = <0>;
+
+            reset-gpios = <&tlmm 3 GPIO_ACTIVE_LOW>;
+            vddi-supply = <&pm4125_l15>;
+            avdd-supply = <&avdd>;
+            avee-supply = <&avee>;
+
+            port {
+                panel_in: endpoint {
+                    remote-endpoint = <&dsi0_out>;
+                };
+            };
+        };
+    };