--- a/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts	2020-12-01 17:53:08.008768652 +0200
+++ b/arch/arm64/boot/dts/rockchip/rk3308-rock-pi-s.dts	2020-12-01 17:54:29.728826515 +0200
@@ -335,3 +335,20 @@
 	pinctrl-0 = <&uart4_xfer &uart4_rts &uart4_cts>;
 	status = "okay";
 };
+
+&u2phy {
+	status = "okay";
+
+	u2phy_host: host-port {
+		phy-supply = <&vcc5v0_otg>;
+		status = "okay";
+	};
+};
+
+&usb_host_ehci {
+	status = "okay";
+};
+
+&usb_host_ohci{
+	status = "okay";
+};