dt-bindings: display: Add bindings for EBBG FT8719

Add bindings for the EBBG FT8719 6.18" 2246x1080 DSI video mode panel,
which can be found on some Xiaomi Poco F1 phones. The backlight is
managed through the QCOM WLED driver.
Signed-off-by: Joel Selvaraj <jo@jsfamily.in>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/BY5PR02MB7009E821B0D4AC20E11F8F13D9DF9@BY5PR02MB7009.namprd02.prod.outlook.com

Documentation/devicetree/bindings/display/panel/ebbg,ft8719.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/ebbg,ft8719.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: EBBG FT8719 MIPI-DSI LCD panel
+
+maintainers:
+  - Joel Selvaraj <jo@jsfamily.in>
+
+description: |
+  The FT8719 panel from EBBG is a FHD+ LCD display panel with a resolution
+  of 1080x2246. It is a video mode DSI panel. The backlight is managed
+  through the QCOM WLED driver.
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: ebbg,ft8719
+
+  reg:
+    maxItems: 1
+    description: DSI virtual channel of the peripheral
+
+  vddio-supply:
+    description: power IC supply regulator
+
+  vddpos-supply:
+    description: positive boost supply regulator
+
+  vddneg-supply:
+    description: negative boost supply regulator
+
+required:
+  - compatible
+  - reg
+  - vddio-supply
+  - vddpos-supply
+  - vddneg-supply
+  - reset-gpios
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      panel@0 {
+        compatible = "ebbg,ft8719";
+        reg = <0>;
+
+        vddio-supply = <&vreg_l14a_1p88>;
+        vddpos-supply = <&lab>;
+        vddneg-supply = <&ibb>;
+
+        reset-gpios = <&tlmm 6 GPIO_ACTIVE_LOW>;
+
+        backlight = <&pmi8998_wled>;
+
+        port {
+          ebbg_ft8719_in_0: endpoint {
+            remote-endpoint = <&dsi0_out>;
+          };
+        };
+      };
+    };