frege@odroidc2:~$ lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 2: Dev 3, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 1: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 1: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 2: Dev 6, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 6, If 1, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 3: Dev 4, If 0, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 3: Dev 4, If 1, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 3: Dev 4, If 2, Class=Human Interface Device, Driver=usbhid, 480M