Enable the Display Control Unit (DCU) for the Nuvoton MA35D1 SoC.

This patch adds the DCU node to the SoC dtsi and enables it on
the MA35D1 SOM board.

Signed-off-by: Joey Lu <a0987203069@gmail.com>
---
 .../boot/dts/nuvoton/ma35d1-som-256m.dts      | 42 +++++++++++++++++++
 arch/arm64/boot/dts/nuvoton/ma35d1.dtsi       | 26 ++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/arch/arm64/boot/dts/nuvoton/ma35d1-som-256m.dts b/arch/arm64/boot/dts/nuvoton/ma35d1-som-256m.dts
index f6f20a17e501..406dd7998324 100644
--- a/arch/arm64/boot/dts/nuvoton/ma35d1-som-256m.dts
+++ b/arch/arm64/boot/dts/nuvoton/ma35d1-som-256m.dts
@@ -98,6 +98,42 @@ pinctrl_uart16: uart16-pins {
 			power-source = <1>;
 		};
 	};
+
+	dcu {
+		pinctrl_display: display-pins {
+			nuvoton,pins =
+					   <6 8 6>,  /* VSYNC */
+					   <6 9 6>,  /* HSYNC */
+					   <6 10 6>, /* CLK */
+					   <10 4 6>, /* DE */
+					   <8 8 6>,  /* D0 - D23 */
+					   <8 9 6>,
+					   <8 10 6>,
+					   <8 11 6>,
+					   <8 12 6>,
+					   <8 13 6>,
+					   <8 14 6>,
+					   <8 15 6>,
+					   <7 0 6>,
+					   <7 1 6>,
+					   <7 2 6>,
+					   <7 3 6>,
+					   <7 4 6>,
+					   <7 5 6>,
+					   <7 6 6>,
+					   <7 7 6>,
+					   <2 12 6>,
+					   <2 13 6>,
+					   <2 14 6>,
+					   <2 15 6>,
+					   <7 12 6>,
+					   <7 13 6>,
+					   <7 14 6>,
+					   <7 15 6>;
+			bias-disable;
+			power-source = <1>;
+		};
+	};
 };
 
 &uart0 {
@@ -129,3 +165,9 @@ &uart16 {
 	pinctrl-0 = <&pinctrl_uart16>;
 	status = "okay";
 };
+
+&display {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_display>;
+	status = "okay";
+};
diff --git a/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi b/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi
index e51b98f5bdce..7293b5eff046 100644
--- a/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi
+++ b/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi
@@ -379,5 +379,31 @@ uart16: serial@40880000 {
 			clocks = <&clk UART16_GATE>;
 			status = "disabled";
 		};
+
+		panel: panel {
+			compatible = "panel-dpi";
+
+			port {
+				panel_in: endpoint@0 {
+					remote-endpoint = <&dpi_out>;
+				};
+			};
+		};
+
+		display: display@40260000 {
+			compatible = "nuvoton,ma35d1-dcu";
+			reg = <0x0 0x40260000 0x0 0x2000>;
+			interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk DCU_GATE>, <&clk DCUP_DIV>;
+			clock-names = "dcu_gate", "dcup_div";
+			resets = <&sys MA35D1_RESET_DISP>;
+			status = "disabled";
+
+			port {
+				dpi_out: endpoint@0 {
+					remote-endpoint = <&panel_in>;
+				};
+			};
+		};
 	};
 };
-- 
2.43.0