[PATCH 5/5] arm64: dts: rockchip: add USB-C support for ROCK 5B and 5B+

Sebastian Reichel
2025-03-24T17:04:28Z

Add hardware description for the USB-C port in the Radxa ROCK 5 Model
B and B+. This describes the OHCI, EHCI and XHCI USB parts, but not yet
the DisplayPort AltMode, since the bindings for that are not yet upstream.

The fusb302 node is marked with status "fail" on ROCK 5B, since the board
is usually powered through the USB-C port. Handling of errors can result
in hard resets, which removed the bus power for some time resulting in
a board reset.

The main problem right now is that devices are supposed to interact with
the power-supply within 5 seconds after the plug event according to the
USB PD specification. This is more or less impossible to achieve when
the kernel is the first software communicating with the power-supply.

Upstream U-Boot with fusb302 support overrides the status for the
fusb302 node to "okay". That way booting a kernel with the updated DT
on an old U-Boot avoids a reset loop.

This workaround is not needed for the ROCK 5B+, since fusb302 support
landed in U-Boot before the board support gets upstreamed. Apart from
that it also has a dedicated USB-C port with a standalone chip to supply
the board power.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
.../boot/dts/rockchip/rk3588-rock-5b-plus.dts | 4 +
arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dtsi | 137 +++++++++++++++++++++
2 files changed, 141 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-plus.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-plus.dts
index 74c7b6502e4dda4b774f43c704ebaee350703c0d..70339920fd4951dff993a5799ae5db243f07bd6e 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-plus.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b-plus.dts
@@ -105,6 +105,10 @@ vcc5v0_host_en: vcc5v0-host-en {
};
};

+&usbc0 {
+ status = "okay";
+};
+
&vcc5v0_host {
enable-active-high;
gpio = <&gpio1 RK_PA1 GPIO_ACTIVE_HIGH>;
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dtsi
index dccb8492f9f0632abd96c3dafc723e01491abad5..5e119f167cd8ccbd08ff2a2d4955489730ab85fb 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dtsi
@@ -5,6 +5,7 @@
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/leds/common.h>
#include <dt-bindings/soc/rockchip,vop2.h>
+#include <dt-bindings/usb/pd.h>
#include "rk3588.dtsi"

/ {
@@ -92,6 +93,15 @@ rfkill-bt {
shutdown-gpios = <&gpio3 RK_PD5 GPIO_ACTIVE_HIGH>;
};

+ vcc12v_dcin: regulator-vcc12v-dcin {
+ compatible = "regulator-fixed";
+ regulator-name = "vcc12v_dcin";
+ regulator-always-on;
+ regulator-boot-on;
+ regulator-min-microvolt = <12000000>;
+ regulator-max-microvolt = <12000000>;
+ };
+
vcc3v3_pcie2x1l0: regulator-vcc3v3-pcie2x1l0 {
compatible = "regulator-fixed";
enable-active-high;
@@ -146,6 +156,19 @@ vcc5v0_sys: regulator-vcc5v0-sys {
regulator-boot-on;
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
+ vin-supply = <&vcc12v_dcin>;
+ };
+
+ vbus5v0_typec: vbus5v0-typec {
+ compatible = "regulator-fixed";
+ enable-active-high;
+ gpio = <&gpio2 RK_PB6 GPIO_ACTIVE_HIGH>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&vbus5v0_typec_en>;
+ regulator-name = "vbus5v0_typec";
+ regulator-min-microvolt = <5000000>;
+ regulator-max-microvolt = <5000000>;
+ vin-supply = <&vcc5v0_sys>;
};

vcc_1v1_nldo_s3: regulator-vcc-1v1-nldo-s3 {
@@ -309,6 +332,67 @@ regulator-state-mem {
};
};

+&i2c4 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c4m1_xfer>;
+ status = "okay";
+
+ usbc0: usb-typec@22 {
+ compatible = "fcs,fusb302";
+ reg = <0x22>;
+ interrupt-parent = <&gpio3>;
+ interrupts = <RK_PB4 IRQ_TYPE_LEVEL_LOW>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&usbc0_int>;
+ vbus-supply = <&vbus5v0_typec>;
+ /*
+ * When the board is starting to send power-delivery messages
+ * too late (5 seconds according to the specification), the
+ * power-supply reacts with a hard-reset. That removes the
+ * power from VBUS for some time, which resets te whole board.
+ */
+ status = "fail";
+
+ usb_con: connector {
+ compatible = "usb-c-connector";
+ label = "USB-C";
+ data-role = "dual";
+ power-role = "sink";
+ try-power-role = "sink";
+ op-sink-microwatt = <1000000>;
+ sink-pdos =
+ <PDO_FIXED(5000, 3000, PDO_FIXED_USB_COMM)>,
+ <PDO_VAR(5000, 20000, 5000)>;
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ port@0 {
+ reg = <0>;
+ usbc0_role_sw: endpoint {
+ remote-endpoint = <&dwc3_0_role_switch>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+ usbc0_orien_sw: endpoint {
+ remote-endpoint = <&usbdp_phy0_orientation_switch>;
+ };
+ };
+
+ port@2 {
+ reg = <2>;
+ dp_altmode_mux: endpoint {
+ remote-endpoint = <&usbdp_phy0_dp_altmode_mux>;
+ };
+ };
+ };
+ };
+ };
+};
+
&i2c6 {
status = "okay";

@@ -486,6 +570,14 @@ usb {
vcc5v0_host_en: vcc5v0-host-en {
rockchip,pins = <4 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;
};
+
+ usbc0_int: usbc0-int {
+ rockchip,pins = <3 RK_PB4 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
+
+ vbus5v0_typec_en: vbus5v0-typec-en {
+ rockchip,pins = <2 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
};
};

@@ -871,6 +963,14 @@ &uart2 {
status = "okay";
};

+&u2phy0 {
+ status = "okay";
+};
+
+&u2phy0_otg {
+ status = "okay";
+};
+
&u2phy1 {
status = "okay";
};
@@ -898,6 +998,29 @@ &u2phy3_host {
status = "okay";
};

+&usbdp_phy0 {
+ mode-switch;
+ orientation-switch;
+ sbu1-dc-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_HIGH>;
+ sbu2-dc-gpios = <&gpio4 RK_PA7 GPIO_ACTIVE_HIGH>;
+ status = "okay";
+
+ port {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ usbdp_phy0_orientation_switch: endpoint@0 {
+ reg = <0>;
+ remote-endpoint = <&usbc0_orien_sw>;
+ };
+
+ usbdp_phy0_dp_altmode_mux: endpoint@1 {
+ reg = <1>;
+ remote-endpoint = <&dp_altmode_mux>;
+ };
+ };
+};
+
&usbdp_phy1 {
status = "okay";
};
@@ -910,6 +1033,20 @@ &usb_host0_ohci {
status = "okay";
};

+&usb_host0_xhci {
+ usb-role-switch;
+ status = "okay";
+
+ port {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ dwc3_0_role_switch: endpoint {
+ remote-endpoint = <&usbc0_role_sw>;
+ };
+ };
+};
+
&usb_host1_ehci {
status = "okay";
};

--
2.47.2