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

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What: /sys/bus/platform/devices/ci_hdrc.0/role
Date: Mar 2017
Contact: Peter Chen <peter.chen@nxp.com>
Description:
It returns string "gadget" or "host" 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.