$ lsusb -t
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/2p, 480M
|__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M
|__ Port 1: Dev 3, If 0, Class=HID, Driver=usbhid, 1.5M
|__ Port 1: Dev 3, If 1, Class=HID, Driver=usbhid, 1.5M
|__ Port 2: Dev 4, If 0, Class=HID, Driver=usbhid, 1.5M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
|__ Port 2: Dev 2, If 0, Class=HID, Driver=usbhid, 12M
|__ Port 2: Dev 2, If 1, Class=audio, Driver=snd-usb-audio, 12M
|__ Port 2: Dev 2, If 2, Class=audio, Driver=snd-usb-audio, 12M
$ lspci | grep -i usb
00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 05)
00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 05)
03:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)
04:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)