arm64: dts: rockchip: enable usb hub on the radxa rock3 model a

One USB 2.0 host port on the Radxa ROCK3 Model A is connected to the
SoC via a hub. Introduce a voltage regulator to enable this USB hub.

Signed-off-by: Michael Riesch <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Heiko Stuebner <[e-mail]>

arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts

···
 		vin-supply = <&vcc5v0_usb>;
 	};
 
+	vcc5v0_usb_hub: vcc5v0-usb-hub-regulator {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio0 RK_PD5 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&vcc5v0_usb_hub_en>;
+		regulator-name = "vcc5v0_usb_hub";
+		regulator-always-on;
+		vin-supply = <&vcc5v0_usb>;
+	};
+
 	vcc5v0_usb_otg: vcc5v0-usb-otg-regulator {
 		compatible = "regulator-fixed";
 		enable-active-high;
···
 	usb {
 		vcc5v0_usb_host_en: vcc5v0_usb_host_en {
 			rockchip,pins = <0 RK_PA6 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+		vcc5v0_usb_hub_en: vcc5v0_usb_hub_en {
+			rockchip,pins = <0 RK_PD5 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 		vcc5v0_usb_otg_en: vcc5v0_usb_otg_en {
 			rockchip,pins = <0 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>;