mediatek: filogic: Cudy TR3000 USB power gpio switch

I've checked this for 128mb router version and with these changes you could cut off USB power via
```bash
echo 0 > /sys/class/gpio/modem_power/value
```
and get the power back by
```bash
echo 1 > /sys/class/gpio/modem_power/value
```
This could be very useful for those who need to reboot USB modems. Can we add this too?

Signed-off by: Fil Dunsky <[email protected]>

Author: fildunsky

target/linux/mediatek/dts/mt7981b-cudy-tr3000-v1.dtsi

@@ -18,6 +18,16 @@
 		stdout-path = "serial0:115200n8";
 	};
 
+	gpio-export {
+		compatible = "gpio-export";
+
+		usb-power {
+			gpio-export,name = "usb_power";
+			gpio-export,output = <1>;
+			gpios = <&pio 9 GPIO_ACTIVE_LOW>;
+		};
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 
@@ -51,15 +61,6 @@
 			gpios = <&pio 10 GPIO_ACTIVE_LOW>;
 		};
 	};
-
-	usb_vbus: regulator-usb {
-		compatible = "regulator-fixed";
-		regulator-name = "usb-vbus";
-		regulator-min-microvolt = <5000000>;
-		regulator-max-microvolt = <5000000>;
-		gpios = <&pio 9 GPIO_ACTIVE_LOW>;
-		regulator-boot-on;
-	};
 };
 
 &uart0 {
@@ -202,7 +203,6 @@
 
 &xhci {
 	status = "okay";
-	vbus-supply = <&usb_vbus>;
 };
 
 &wifi {

target/linux/mediatek/filogic/base-files/etc/board.d/03_gpio_switches

@@ -5,6 +5,11 @@ board_config_update
 board=$(board_name)
 
 case "$board" in
+cudy,tr3000-256mb-v1|\
+cudy,tr3000-v1|\
+cudy,tr3000-v1-ubootmod)
+	ucidef_add_gpio_switch "usb_power" "USB power" "usb_power" "1"
+	;;
 huasifei,wh3000-pro)
 	ucidef_add_gpio_switch "modem_power" "Modem power" "modem_power" "0"
 	;;