ARM: dts: stm32: enable display support on stm32mp135f-dk board

Link panel and display controller.
Enable panel, backlight and display controller.

Signed-off-by: Raphael Gallais-Pou <[e-mail]>
Signed-off-by: Alexandre Torgue <[e-mail]>

arch/arm/boot/dts/st/stm32mp135f-dk.dts

···
 			default-state = "off";
 		};
 	};
+
+	panel_backlight: panel-backlight {
+		compatible = "gpio-backlight";
+		gpios = <&gpioe 12 GPIO_ACTIVE_HIGH>;
+		default-on;
+		status = "okay";
+	};
+
+	panel_rgb: panel-rgb {
+		compatible = "rocktech,rk043fn48h";
+		enable-gpios = <&gpioi 7 GPIO_ACTIVE_HIGH>;
+		backlight = <&panel_backlight>;
+		power-supply = <&scmi_v3v3_sw>;
+		status = "okay";
+
+		width-mm = <105>;
+		height-mm = <67>;
+
+		panel-timing {
+			clock-frequency = <10000000>;
+			hactive = <480>;
+			hback-porch = <43>;
+			hfront-porch = <10>;
+			hsync-len = <1>;
+			hsync-active = <0>;
+			vactive = <272>;
+			vback-porch = <26>;
+			vfront-porch = <4>;
+			vsync-len = <10>;
+			vsync-active = <0>;
+			de-active = <1>;
+			pixelclk-active = <1>;
+		};
+
+		port {
+			panel_in_rgb: endpoint {
+				remote-endpoint = <&ltdc_out_rgb>;
+			};
+		};
+	};
 };
 
 &adc_1 {
···
 &iwdg2 {
 	timeout-sec = <32>;
 	status = "okay";
+};
+
+&ltdc {
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&ltdc_pins_a>;
+	pinctrl-1 = <&ltdc_sleep_pins_a>;
+	status = "okay";
+
+	port {
+		ltdc_out_rgb: endpoint {
+			remote-endpoint = <&panel_in_rgb>;
+		};
+	};
 };
 
 &rtc {