USB pass through in QEMU command line for ARM machines

Hi All,

        I want boot the QEMU ARM machine with USB emulation, initially i launched the QEMU ARM machine but i cant able to see the usb devices using lsusb command.

       so thought to pass the Host USB to QEMU for that i passed the below configuration to QEMU command line 
        -usb -device usb-host, vendorid<xxxxx>, productid<xxxxx>
       then when i launch the QEMU am facing the below problem
       "No usb bus found for usb-devices".
      How to identify the bus for usb-host to pass through.
      Any help would be appreciated.
Thanks,
Srinuvasan.A
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