[PATCH 3/3] arm64: dts: rockchip: orangepi-5-pro: Add LT8711UXD DP-to-HDMI bridge

[Dennis Gilmore]

Wire up the second HDMI port on the Orange Pi 5 Pro. It uses a Lontium
LT8711UXD high performance two lane Type-C/DP1.4 to HDMI2.0 converter,
designed to connect a USB Type-C source or a DP1.4 source to an HDMI2.0
sink. The bridge can be controlled via i2c or run as an autonomous device.

The Orange Pi 5 Pro has i2c wired up to i2c6, however there are 10k
resistors left off of R9 and R17 to enable MODE_SEL, and R27 for
I2C_ADDR resulting in MODE_SEL going to GND and the bridge let in
autonomous mode. As shipped I verified that the bridge does not show up
on the i2c bus.

Signed-off-by: Dennis Gilmore <dennis at ausil.us>
---
 .../dts/rockchip/rk3588s-orangepi-5-pro.dts   | 88 ++++++++++++++++++-
 1 file changed, 85 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5-pro.dts b/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5-pro.dts
index 895d954a9f23..67363709c4ca 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-orangepi-5-pro.dts
@@ -14,6 +14,44 @@ aliases {
 		mmc2 = &sdio;
 	};
 
+	hdmi1-con {
+		compatible = "hdmi-connector";
+		label = "HDMI1 OUT";
+		type = "a";
+
+		port {
+			hdmi1_con_in: endpoint {
+				remote-endpoint = <&lt8711uxd_out>;
+			};
+		};
+	};
+
+	hdmi-bridge {
+		compatible = "lontium,lt8711uxd";
+		vdd-supply = <&vcc3v3_dp>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port at 0 {
+				reg = <0>;
+
+				lt8711uxd_in: endpoint {
+					remote-endpoint = <&dp0_out_con>;
+				};
+			};
+
+			port at 1 {
+				reg = <1>;
+
+				lt8711uxd_out: endpoint {
+					remote-endpoint = <&hdmi1_con_in>;
+				};
+			};
+		};
+	};
+
 	analog-sound {
 		compatible = "simple-audio-card";
 		pinctrl-names = "default";
@@ -72,6 +110,19 @@ fan: pwm-fan {
 		pwms = <&pwm2 0 20000000 0>;
 	};
 
+	vcc3v3_dp: regulator-vcc3v3-dp {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpios = <&gpio3 RK_PC2 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&dp_bridge_en>;
+		regulator-max-microvolt = <3300000>;
+		regulator-min-microvolt = <3300000>;
+		regulator-name = "vcc3v3_dp";
+		regulator-always-on;
+		vin-supply = <&vcc_3v3_s3>;
+	};
+
 	vcc3v3_eth: regulator-vcc3v3-eth {
 		compatible = "regulator-fixed";
 		enable-active-high;
@@ -116,6 +167,24 @@ typea_con: usb-a-connector {
 	};
 };
 
+&dp0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&dp0m0_pins>;
+	status = "okay";
+};
+
+&dp0_in {
+	dp0_in_vp1: endpoint {
+		remote-endpoint = <&vp1_out_dp0>;
+	};
+};
+
+&dp0_out {
+	dp0_out_con: endpoint {
+		remote-endpoint = <&lt8711uxd_in>;
+	};
+};
+
 &i2c1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c1m4_xfer>;
@@ -217,6 +286,12 @@ bt_wake_host_irq: bt-wake-host-irq {
 		};
 	};
 
+	dp {
+		dp_bridge_en: dp-bridge-en {
+			rockchip,pins = <3 RK_PC2 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+	};
+
 	ethernet {
 		ethernet_en: ethernet-en {
 			rockchip,pins = <3 RK_PB7 RK_FUNC_GPIO &pcfg_pull_down>;
@@ -350,9 +425,16 @@ &usb_host0_xhci {
 
 &usbdp_phy0 {
 	/*
-	 * The USB3 Type-A host connector is wired to PHY lanes 2/3. Lanes 0/1
-	 * are connected to the LT8711UXD DP-to-HDMI bridge on the board.
-	 * dp-lane-mux routes USB3 SuperSpeed to the correct lanes.
+	 * USBDP PHY0 is wired to a USB3 Type-A host connector via lanes 2/3.
+	 * Additionally lanes 0/1 and the aux channel are wired to the
+	 * Lontium LT8711UXD DP-to-HDMI bridge feeding the HDMI1 connector.
 	 */
 	rockchip,dp-lane-mux = <0 1>;
 };
+
+&vp1 {
+	vp1_out_dp0: endpoint at a {
+		reg = <ROCKCHIP_VOP2_EP_DP0>;
+		remote-endpoint = <&dp0_in_vp1>;
+	};
+};
-- 
2.54.0