/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-mtk/0p, 5000M
    ID 1d6b:0003 Linux Foundation 3.0 root hub
    /sys/bus/usb/devices/usb2  /dev/bus/usb/002/001
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-mtk/1p, 480M
    ID 1d6b:0002 Linux Foundation 2.0 root hub
    /sys/bus/usb/devices/usb1  /dev/bus/usb/001/001
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/3p, 480M
        ID 05e3:0608 Genesys Logic, Inc. Hub
        /sys/bus/usb/devices/1-1  /dev/bus/usb/001/002
        |__ Port 3: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
            ID 0408:a064 Quanta Computer, Inc. 
            /sys/bus/usb/devices/1-1.3  /dev/bus/usb/001/003
        |__ Port 3: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
            ID 0408:a064 Quanta Computer, Inc. 
            /sys/bus/usb/devices/1-1.3  /dev/bus/usb/001/003
