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USB role switch in Imx6q sabre AI

Question asked by shravan sundar raj on Apr 28, 2017
Latest reply on May 11, 2017 by Gilles Talis
if you refer this document
it says the procedure to do role switch
/sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req
/sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req
nodes responsible for role switch
but these nodes doesnt exist in the sysfs.
What needs to be done to see these files in sysfs  ?
Any code changes or  any kernel features needs to be enabled?

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