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