18c2ecf20Sopenharmony_ciWhat:		/sys/bus/platform/devices/ci_hdrc.0/role
28c2ecf20Sopenharmony_ciDate:		Mar 2017
38c2ecf20Sopenharmony_ciContact:	Peter Chen <peter.chen@nxp.com>
48c2ecf20Sopenharmony_ciDescription:
58c2ecf20Sopenharmony_ci		It returns string "gadget" or "host" when read it, it indicates
68c2ecf20Sopenharmony_ci		current controller role.
78c2ecf20Sopenharmony_ci
88c2ecf20Sopenharmony_ci		It will do role switch when write "gadget" or "host" to it.
98c2ecf20Sopenharmony_ci		Only controller at dual-role configuration supports writing.
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