riscv: dts: spacemit: enable USB 3 ports on Milk-V Jupiter

Enable the DWC3 USB 3.0 controller (USB#2 port in the K1 datasheet) and
its associated combo_phy (USB 3 PHY) and usbphy2 (USB 2 PHY) on the
Milk-V Jupiter board.

The board uses a VLI VL817 hub, providing four ports. Two are routed to
the 3.0 type-A connectors, and two to the F_USB3 front USB header. The
hub requires two separate 5V power supplies: one for the hub itself and
one for the USB connectors. Add an always-on regulator sourcing 5V from
the DC-IN input, along with two GPIO-controlled fixed regulators to
manage the hub and connectors power supplies.

Note that the board also provides four USB 2.0 ports (two via type-A
connectors and two via the F_USB2 front USB header), but these are
handled by a different controller (USB#1 port in the K1 datasheet).

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Yixun Lan <dlan@kernel.org>
Link: https://lore.kernel.org/r/20260326183745.1370642-6-aurelien@aurel32.net
Signed-off-by: Yixun Lan <dlan@kernel.org>

Author: aurel32

arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts

@@ -58,6 +58,41 @@
 		regulator-always-on;
 		vin-supply = <&reg_dc_in>;
 	};
+
+	reg_vcc_5v: regulator-vcc-5v {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_5v";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-boot-on;
+		regulator-always-on;
+		vin-supply = <&reg_dc_in>;
+	};
+
+	regulator-usb3-vbus-5v {
+		compatible = "regulator-fixed";
+		regulator-name = "USB30_VBUS";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		regulator-always-on;
+		vin-supply = <&reg_vcc_5v>;
+		gpio = <&gpio K1_GPIO(97) GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+
+	usb3_hub_5v: regulator-usb3-hub-5v {
+		compatible = "regulator-fixed";
+		regulator-name = "USB30_HUB";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		vin-supply = <&reg_vcc_5v>;
+		gpio = <&gpio K1_GPIO(123) GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+};
+
+&combo_phy {
+	status = "okay";
 };
 
 &eth0 {
@@ -302,3 +337,30 @@
 	pinctrl-0 = <&uart0_2_cfg>;
 	status = "okay";
 };
+
+&usbphy2 {
+	status = "okay";
+};
+
+&usb_dwc3 {
+	dr_mode = "host";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	hub_2_0: hub@1 {
+		compatible = "usb2109,2817";
+		reg = <0x1>;
+		vdd-supply = <&usb3_hub_5v>;
+		peer-hub = <&hub_3_0>;
+		reset-gpios = <&gpio K1_GPIO(124) GPIO_ACTIVE_LOW>;
+	};
+
+	hub_3_0: hub@2 {
+		compatible = "usb2109,817";
+		reg = <0x2>;
+		vdd-supply = <&usb3_hub_5v>;
+		peer-hub = <&hub_2_0>;
+		reset-gpios = <&gpio K1_GPIO(124) GPIO_ACTIVE_LOW>;
+	};
+};