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

Dennis Gilmore
2026-04-29T04:15:51Z

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@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@0 {
+ reg = <0>;
+
+ lt8711uxd_in: endpoint {
+ remote-endpoint = <&dp0_out_con>;
+ };
+ };
+
+ port@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@a {
+ reg = <ROCKCHIP_VOP2_EP_DP0>;
+ remote-endpoint = <&dp0_in_vp1>;
+ };
+};
--
2.54.0