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What: /sys/bus/platform/devices/5b110000.usb3/role
Date: Jan 2019
Contact: Peter Chen <peter.chen@nxp.com>
Description:
It returns string "gadget", "host" and "none" when read it,
it indicates current controller role.
It will do role switch when write "gadget" or "host" to it.
Only controller at dual-role configuration supports writing.
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