empire@linuxcnc:~$ lsusb -t
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/8p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 3, If 0, Class=HID, Driver=usbhid, 1.5M
        |__ Port 3: Dev 4, If 0, Class=hub, Driver=hub/4p, 480M
            |__ Port 1: Dev 5, If 0, Class=HID, Driver=usbhid, 1.5M
            |__ Port 1: Dev 5, If 1, Class=HID, Driver=usbhid, 1.5M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 480M
empire@linuxcnc:~$