Checking on how many USB root hosts exists in Nvidia Jetson Nano B01

root@jnode-1:~# lsusb -t

/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/4p, 5000M

    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M

        |__ Port 1: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M

        |__ Port 2: Dev 4, If 0, Class=Mass Storage, Driver=usb-storage, 5000M

        |__ Port 4: Dev 5, If 0, Class=Mass Storage, Driver=uas, 5000M

/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/5p, 480M

    |__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M