attach a driver-defined port structure
int uart_add_one_port (
|struct uart_driver * drv, |
| ||struct uart_port * uport|
pointer to the uart low level driver structure for this port
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.