Attach a driver-defined port structure
int uart_add_one_port(struct uart_driver * drv, struct uart_port * uport);
drv
pointer to the uart low level driver structure for this port
uport
uart port structure to use for this port.
This allows the driver to register its own uart_port structure with the core driver. The main purpose is to allow the low level uart drivers to expand uart_port, rather than having yet more levels of structures.