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