arm64: dts: mediatek: mt8395-nio-12l: Preconfigure DSI0 pipeline

This board can use a MIPI-DSI panel on the DSI0 connector: in
preparation for adding an overlay for the Radxa Display 8HD,
add a pipeline connecting VDOSYS0 components to DSI0.

This pipeline remains disabled by default, as it is expected
to be enabled only by a devicetree overlay that declares the
actual DSI panel node, completing the graph.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

arch/arm64/boot/dts/mediatek/mt8395-radxa-nio-12l.dts

@@ -186,6 +186,10 @@ &cpu7 {
 	cpu-supply = <&mt6315_6_vbuck1>;
 };
 
+&dither0_out {
+	remote-endpoint = <&dsi0_in>;
+};
+
 &dpi1 {
 	status = "okay";
 };
@@ -198,6 +202,29 @@ &dpi1_out {
 	remote-endpoint = <&hdmi0_in>;
 };
 
+&dsi0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+			dsi0_in: endpoint {
+				remote-endpoint = <&dither0_out>;
+			};
+		};
+
+		port@1 {
+			reg = <1>;
+			dsi0_out: endpoint { };
+		};
+	};
+};
+
+
 &eth {
 	phy-mode = "rgmii-rxid";
 	phy-handle = <&rgmii_phy>;