dt-bindings: display: panel: Add Ilitek ILI9488 panel controller

Add binding for the Ilitek ILI9488 panel controller which is found on
the FocusLCDs E35GH-I-MW800-CB MIPI DSI panel. Add "focuslcds" to
vendor-prefixes.yaml as it's a brandname and a website
(https://focuslcds.com/) for Focus Display Solutions, Inc.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Igor Reznichenko <igor@reznichenko.net>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260617143245.372182-2-igor@reznichenko.net

Documentation/devicetree/bindings/display/panel/ilitek,ili9488.yaml

@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/ilitek,ili9488.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ilitek ILI9488 based MIPI-DSI panels
+
+maintainers:
+  - Igor Reznichenko <igor@reznichenko.net>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - focuslcds,e35gh-i-mw800cb
+      - const: ilitek,ili9488
+
+  reg:
+    maxItems: 1
+
+  vci-supply: true
+  iovcc-supply: true
+
+required:
+  - compatible
+  - reg
+  - vci-supply
+  - iovcc-supply
+  - reset-gpios
+  - backlight
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "focuslcds,e35gh-i-mw800cb", "ilitek,ili9488";
+            reg = <0>;
+            vci-supply = <&reg_vci_panel>;
+            iovcc-supply = <&reg_iovcc_panel>;
+            reset-gpios = <&gpio3 6 GPIO_ACTIVE_LOW>;
+            backlight = <&pwm_bl>;
+
+            port {
+                panel_in: endpoint {
+                    remote-endpoint = <&dsi_out>;
+                };
+            };
+        };
+    };
+
+...

Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -604,6 +604,8 @@ patternProperties:
     description: Flipkart Inc.
   "^focaltech,.*":
     description: FocalTech Systems Co.,Ltd
+  "^focuslcds,.*":
+    description: Focus Display Solutions, Inc.
   "^forlinx,.*":
     description: Baoding Forlinx Embedded Technology Co., Ltd.
   "^foursemi,.*":