> > > > > > > > 4) A-device switch back to host. > > > > - On B-device: > > > > + 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 > > > > > > why is this still chipidea specific ? Why isn't this part on > > > udc-core so that all OTG UDCs can support this too ? > > > > > > > Currently, hnp polling is enabled during the otg fsm handling, but > > there is no otg framework (like udc core, Roger Quadros is doing > > that), so no common sys entry for otg fsm variables to control otg fsm. > > then we wait for whatever Roger's doing, otherwise this will be another ABI to > support forever. This ABI has already existed, see Documentation/ABI/testing/sysfs-platform-chipidea-usb-otg We will move more OTG FSM features into otg framework in future, but it does not conflict we enhance OTG FSM now. Peter -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
