$ lsusb -t
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 10000M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 1: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 12M
|__ Port 4: Dev 5, If 0, Class=Chip/SmartCard, Driver=, 12M
|__ Port 2: Dev 3, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 7, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 4: Dev 7, If 1, Class=Video, Driver=uvcvideo, 480M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
|__ Port 2: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
|__ Port 2: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/1p, 480M