1a932a804SPeter ChenWhat:		/sys/bus/platform/devices/ci_hdrc.0/role
2a932a804SPeter ChenDate:		Mar 2017
3a932a804SPeter ChenContact:	Peter Chen <[email protected]>
4a932a804SPeter ChenDescription:
5*c68c0db4SRandy Dunlap		When read, it returns string "gadget" or "host", indicating
6*c68c0db4SRandy Dunlap		the current controller role.
7a932a804SPeter Chen
8*c68c0db4SRandy Dunlap		It will do role switch when "gadget" or "host" is written to it.
9a932a804SPeter Chen		Only controller at dual-role configuration supports writing.
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