arm64: dts: rockchip: hook up the px30-evb dsi display

Create the necessary display nodes to activate the Xingpeng XPP055C272
dsi display that can be found on the px30-evb.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Link: https://lore.kernel.org/r/20191209145301.5307-2-heiko@sntech.de

arch/arm64/boot/dts/rockchip/px30-evb.dts

@@ -112,6 +112,38 @@ &display_subsystem {
 	status = "okay";
 };
 
+&dsi {
+	status = "okay";
+
+	ports {
+		mipi_out: port@1 {
+			reg = <1>;
+
+			mipi_out_panel: endpoint {
+				remote-endpoint = <&mipi_in_panel>;
+			};
+		};
+	};
+
+	panel@0 {
+		compatible = "xinpeng,xpp055c272";
+		reg = <0>;
+		backlight = <&backlight>;
+		iovcc-supply = <&vcc_1v8>;
+		vci-supply = <&vcc3v3_lcd>;
+
+		port {
+			mipi_in_panel: endpoint {
+				remote-endpoint = <&mipi_out_panel>;
+			};
+		};
+	};
+};
+
+&dsi_dphy {
+	status = "okay";
+};
+
 &emmc {
 	bus-width = <8>;
 	cap-mmc-highspeed;