=> usb tree
USB device tree:
  1  Hub (5 Gb/s, 0mA)
  |  U-Boot XHCI Host Controller 
  |
  +-2  Hub (5 Gb/s, 0mA)
  | |  GenesysLogic USB3.0 Hub 
  | |
  | +-5  Vendor specific (5 Gb/s, 36mA)
  |      Realtek USB 10/100/1000 LAN 00E04C680977
  |    
  +-3  Hub (480 Mb/s, 100mA)
  | |  GenesysLogic USB2.0 Hub 
  | |
  | +-6  Mass Storage (480 Mb/s, 98mA)
  | | |  USBest Technology USB Mass Storage Device 101111c452b7c0
  | | |
  | +-7  Human Interface (1.5 Mb/s, 98mA)
  | |     USB Optical Mouse 
  | |  
  | +-8  Human Interface (1.5 Mb/s, 70mA)
  |      Dell Dell USB Keyboard 
  |    
  +-4  Mass Storage (480 Mb/s, 300mA)
    |  JetFlash Mass Storage Device 16Q6ZPH20GF3E8UQ
    |