/sys/devices/platform/rt3xxx-ehci/usb_host%3Ausb_host2/device/usb2/usb_endpoint%3Ausbdev2.1_ep00/subsystem/

../
usbdev1.1_ep00/
usbdev1.1_ep81/
usbdev2.1_ep00/
usbdev2.1_ep81/