uart_set_options — setup the serial console parameters
int uart_set_options
(struct uart_port * port, struct console * co, int baud, int parity, int bits, int flow);
pointer to the serial ports uart_port structure
console pointer
baud rate
parity character - 'n' (none), 'o' (odd), 'e' (even)
number of data bits
flow control character - 'r' (rts)