USBNC_USB_UH1_CTRL
v = bus_space_read_4(usbc->sc_iot, usbc->sc_ioh_usbnc, USBNC_USB_UH1_CTRL);
bus_space_write_4(usbc->sc_iot, usbc->sc_ioh_usbnc, USBNC_USB_UH1_CTRL, v);