usb_bus_start_enum (9) - Linux Man Pages
usb_bus_start_enum: start immediate enumeration (for OTG)
usb_bus_start_enum - start immediate enumeration (for OTG)
int usb_bus_start_enum(struct usb_bus
*bus, unsigned port_num);
- the bus (must use hcd framework)
- 1-based number of port; usually bus->otg_port
Starts enumeration, with an immediate reset followed later by hub_wq identifying and possibly configuring the device. This is needed by OTG controller drivers, where it helps meet HNP protocol timing requirements for starting a port reset.