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uart_register_driver - register a driver with the uart core layer
int uart_register_driver (struct uart_driver * drv);
drv low level driver structure
Register a uart driver with the core driver. We in turn register with
the tty layer, and initialise the core driver per-port state.
We have a proc file in /proc/tty/driver which is named after the normal
drv->port should be NULL, and the per-port structures should be
registered using uart_add_one_port after this call has succeeded.