dt-bindings: display: panel: Add Himax HX8279/HX8279-D DDIC panels

Himax HX8279 is a Display DriverIC suitable for driving LCD
MIPI-DSI panels.

Describe this DriverIC, the Startek KD070FHFID078 panel found
on newer revisions of the MediaTek Genio 510/700/1200 Evaluation
Kits (EVK), and the Aoly SL101PM1794FOG-V15 found on some i.MX8MM
boards.

Acked-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: AngeloGioacchino Del Regno <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/display/panel/himax,hx8279.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/himax,hx8279.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Himax HX8279/HX8279-D based MIPI-DSI panels
+
+maintainers:
+  - AngeloGioacchino Del Regno <[e-mail]>
+
+description:
+  The Himax HX8279 is a 1803 channel outputs source driver with MIPI
+  TCON, which generates the horizontal and vertical control timing to
+  the source and gate drivers.
+  This DriverIC is most suitable for 1200x1920, 1080x1920, 1200x1600,
+  and 600x1024 panels and outputs full RGB888 over two or four lanes,
+  single or dual, MIPI-DSI video interface.
+
+allOf:
+  - $ref: panel-common-dual.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - aoly,sl101pm1794fog-v15
+          - startek,kd070fhfid078
+      - const: himax,hx8279
+
+  reg:
+    maxItems: 1
+
+  iovcc-supply:
+    description: I/O voltage supply
+
+  vdd-supply:
+    description: Panel power supply
+
+required:
+  - compatible
+  - reg
+  - backlight
+  - reset-gpios
+  - iovcc-supply
+  - vdd-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "startek,kd070fhfid078", "himax,hx8279";
+            reg = <0>;
+            backlight = <&backlight>;
+            enable-gpios = <&pio 25 GPIO_ACTIVE_HIGH>;
+            reset-gpios = <&pio 45 GPIO_ACTIVE_HIGH>;
+            iovcc-supply = <&vreg_lcm_vio>;
+            vdd-supply = <&vreg_lcm_vdd>;
+
+            port {
+                panel_in: endpoint {
+                    remote-endpoint = <&dsi_out>;
+                };
+            };
+        };
+    };
+
+...