Documentation/ABI/testing/sysfs-platform-chipidea-usb2

   1 What:           /sys/bus/platform/devices/ci_hdrc.0/role
   2 Date:           Mar 2017
   3 Contact:        Peter Chen <peter.chen@nxp.com>
   4 Description:
   5                 When read, it returns string "gadget" or "host", indicating
   6                 the current controller role.
   7
   8                 It will do role switch when "gadget" or "host" is written to it.
   9                 Only controller at dual-role configuration supports writing.