[PATCH] arm64: dts: rockchip: Enable HDMI 4K (DP to HDMI) port for Radxa ROCK 5A

[FUKAUMI Naoki]

Enable the HDMI 4K port located next to the USB Type-C power port.
It's driven by DP0 on the RK3588S via a RA620 DP to HDMI converter.

Note that ROCKCHIP_VOP2_EP_DP0 is defined as 10 in dt-binding header,
but it will trigger a dtc warning like "graph node unit address error,
expected "a"" if we use it directly after endpoint, so we use "a"
instead here.

Signed-off-by: FUKAUMI Naoki <naoki at radxa.com>
---
This patch depends
 https://patchwork.kernel.org/project/linux-rockchip/cover/20250312104214.525242-1-andyshrk@163.com/
---
 .../boot/dts/rockchip/rk3588s-rock-5a.dts     | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
index f894742b1ebe..6173b0ccb639 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5a.dts
@@ -36,6 +36,17 @@ chosen {
 		stdout-path = "serial2:1500000n8";
 	};
 
+	dp-con {
+		compatible = "dp-connector";
+		type = "full-size"; // HDMI Type-D via RA620
+
+		port {
+			dp_con_in: endpoint {
+				remote-endpoint = <&dp0_out_con>;
+			};
+		};
+	};
+
 	hdmi0-con {
 		compatible = "hdmi-connector";
 		type = "d";
@@ -178,6 +189,24 @@ &cpu_l3 {
 	cpu-supply = <&vdd_cpu_lit_s0>;
 };
 
+&dp0 {
+	status = "okay";
+	pinctrl-0 = <&dp0m1_pins>;
+	pinctrl-names = "default";
+};
+
+&dp0_in {
+	dp0_in_vp2: endpoint {
+		remote-endpoint = <&vp2_out_dp0>;
+	};
+};
+
+&dp0_out {
+	dp0_out_con: endpoint {
+		remote-endpoint = <&dp_con_in>;
+	};
+};
+
 &gpu {
 	mali-supply = <&vdd_gpu_s0>;
 	status = "okay";
@@ -849,3 +878,10 @@ vp0_out_hdmi0: endpoint at ROCKCHIP_VOP2_EP_HDMI0 {
 		remote-endpoint = <&hdmi0_in_vp0>;
 	};
 };
+
+&vp2 {
+	vp2_out_dp0: endpoint at a {
+		reg = <ROCKCHIP_VOP2_EP_DP0>;
+		remote-endpoint = <&dp0_in_vp2>;
+	};
+};
-- 
2.43.0