[PATCH v1 1/1] arm64: dts: rockchip: Add USB-C support to ROCK 5B

[Sebastian Reichel]

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

The fusb302 node is marked with status "fail", 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 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.

Recent U-Boot (v2025.01) will start doing USB-PD communication, which
solves this issue. Upstream U-Boot doing USB-PD communication will also
set the fusb302 node status to "okay". That way booting a kernel with
the updated DT on an old U-Boot avoids a reset loop.

Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
---
 .../boot/dts/rockchip/rk3588-rock-5b.dts      | 121 ++++++++++++++++++
 1 file changed, 121 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
index d597112f1d5b..cb5990df6ccb 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
@@ -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"
 
 / {
@@ -84,6 +85,15 @@ 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;
@@ -142,6 +152,7 @@ vcc5v0_sys: regulator-vcc5v0-sys {
 		regulator-boot-on;
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
+		vin-supply = <&vcc12v_dcin>;
 	};
 
 	vcc_1v1_nldo_s3: regulator-vcc-1v1-nldo-s3 {
@@ -264,6 +275,67 @@ regulator-state-mem {
 	};
 };
 
+&i2c4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c4m1_xfer>;
+	status = "okay";
+
+	usbc0: usb-typec at 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 = <&vcc12v_dcin>;
+		/*
+		 * 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 at 0 {
+					reg = <0>;
+					usbc0_role_sw: endpoint {
+						remote-endpoint = <&dwc3_0_role_switch>;
+					};
+				};
+
+				port at 1 {
+					reg = <1>;
+					usbc0_orien_sw: endpoint {
+						remote-endpoint = <&usbdp_phy0_orientation_switch>;
+					};
+				};
+
+				port at 2 {
+					reg = <2>;
+					dp_altmode_mux: endpoint {
+						remote-endpoint = <&usbdp_phy0_dp_altmode_mux>;
+					};
+				};
+			};
+		};
+	};
+};
+
 &i2c6 {
 	status = "okay";
 
@@ -423,6 +495,10 @@ 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>;
+		};
 	};
 };
 
@@ -835,6 +911,14 @@ &uart2 {
 	status = "okay";
 };
 
+&u2phy0 {
+	status = "okay";
+};
+
+&u2phy0_otg {
+	status = "okay";
+};
+
 &u2phy1 {
 	status = "okay";
 };
@@ -866,6 +950,29 @@ &usbdp_phy1 {
 	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 at 0 {
+			reg = <0>;
+			remote-endpoint = <&usbc0_orien_sw>;
+		};
+
+		usbdp_phy0_dp_altmode_mux: endpoint at 1 {
+			reg = <1>;
+			remote-endpoint = <&dp_altmode_mux>;
+		};
+	};
+};
+
 &usb_host0_ehci {
 	status = "okay";
 };
@@ -874,6 +981,20 @@ &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";
 };
-- 
2.45.2