receive_chars
receive_chars(info);
receive_chars(up);
receive_chars(up, &lsr);
.receive_chars = rsci_receive_chars,
receive_chars(up, &status);
void (*receive_chars)(struct uart_port *port);
s->ops->receive_chars(port);
s->ops->receive_chars(port);
.receive_chars = sci_receive_chars,
int (*receive_chars)(struct uart_port *port);
.receive_chars = receive_chars_getchar,
.receive_chars = receive_chars_read,
if (sunhv_ops->receive_chars(port))
tport = receive_chars(port);
receive_chars(port);
port = receive_chars(up, &status);
receive_chars(up, &status);