Bring up USB on mt2500 target. (#110)

uboot-mtk-20230718-09eda825/arch/arm/dts/mt7981-glinet-gl-mt2500.dts

@@ -23,7 +23,6 @@
 		bootcmd = "mtkboardboot";
 		blink_led = "blue:run";
 		system_led = "white:system";
-		gpio_power_clr = <12>;
 	};
 
 	memory@40000000 {
@@ -130,3 +129,11 @@
 &watchdog {
 	status = "disabled";
 };
+
+&usb_phy {
+  status = "okay";
+};
+
+&xhci {
+  status = "okay";
+};

uboot-mtk-20230718-09eda825/arch/arm/dts/mt7981.dtsi

@@ -8,6 +8,7 @@
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/clock/mt7981-clk.h>
 #include <dt-bindings/reset/mt7629-reset.h>
+#include <dt-bindings/phy/phy.h>
 #include <dt-bindings/pinctrl/mt65xx.h>
 #include <dt-bindings/input/linux-event-codes.h>
 
@@ -336,4 +337,51 @@
 		status = "disabled";
 	};
 
+	usb_phy: usb-phy@11e10000 {
+		compatible = "mediatek,mt7981",
+			"mediatek,generic-tphy-v2";
+		ranges = <0 0x11e10000 0x1700>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		status = "disabled";
+
+		u2port0: usb-phy@0 {
+			reg = <0x0 0x700>;
+			clocks = <&topckgen CK_TOP_USB_FRMCNT_SEL>;
+			clock-names = "ref";
+			#phy-cells = <1>;
+		};
+
+		u3port0: usb-phy@700 {
+			reg = <0x700 0x900>;
+			clocks = <&topckgen CK_TOP_USB3_PHY_SEL>;
+			clock-names = "ref";
+			#phy-cells = <1>;
+			mediatek,syscon-type = <&topmisc 0x218 0>;
+			status = "okay";
+		};
+	};
+
+	reg_3p3v: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-3.3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
+	xhci: usb@11200000 {
+		compatible = "mediatek,mt7986-xhci",
+			"mediatek,mtk-xhci";
+		reg = <0x11200000 0x2e00>,
+			<0x11203e00 0x0100>;
+		reg-names = "mac", "ippc";
+		interrupts = <GIC_SPI 173 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&topckgen CK_TOP_U2U3_XHCI_SEL>;
+		phys = <&u2port0 PHY_TYPE_USB2>,
+			<&u3port0 PHY_TYPE_USB3>;
+		vusb33-supply = <&reg_3p3v>;
+		status = "disabled";
+	};
 };

uboot-mtk-20230718-09eda825/configs/mt7981_glinet_gl-mt2500_defconfig

@@ -51,6 +51,7 @@ CONFIG_CMD_LSBLK=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_PART=y
 CONFIG_CMD_READ=y
+CONFIG_CMD_USB=y
 CONFIG_CMD_TFTPPUT=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_SMC=y
@@ -81,6 +82,8 @@ CONFIG_LED=y
 CONFIG_LED_BLINK=y
 CONFIG_LED_GPIO=y
 CONFIG_MMC_MTK=y
+CONFIG_PHY=y
+CONFIG_PHY_MTK_TPHY=y
 CONFIG_PHY_FIXED=y
 CONFIG_MEDIATEK_ETH=y
 CONFIG_PINCTRL=y
@@ -101,3 +104,9 @@ CONFIG_FAT_WRITE=y
 CONFIG_HEXDUMP=y
 # CONFIG_EFI_LOADER is not set
 CONFIG_LMB_MAX_REGIONS=64
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_HOST=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_MTK=y
+CONFIG_USB_STORAGE=y