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Commit dfbae330 authored by Li Jun's avatar Li Jun Committed by Felipe Balbi
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Documentation: usb: chipidea: Update test procedure for HNP polling 



Update HNP test procedure as HNP polling is supported.

Acked-by: default avatarPeter Chen <peter.chen@nxp.com>
Signed-off-by: default avatarLi Jun <jun.li@nxp.com>
Signed-off-by: default avatarFelipe Balbi <balbi@kernel.org>
parent 75d2f754

Documentation/usb/chipidea.txt

+5 −4
Original line number Diff line number Diff line
@@ -26,16 +26,17 @@ cat /sys/kernel/debug/ci_hdrc.0/registers 
   On B-device:

   echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req



   if HNP polling is not supported, also need:

   On A-device:

   echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req



   B-device should take host role and enumrate A-device.



4) A-device switch back to host.

   On B-device:

   echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req



   or, by introducing HNP polling, B-Host can know when A-peripheral wish

   to be host role, so this role switch also can be trigged in A-peripheral

   side by answering the polling from B-Host, this can be done on A-device:

   echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req



   A-device should switch back to host and enumrate B-device.



5) Remove B-device(unplug micro B plug) and insert again in 10 seconds,