[SERIAL] Add prototypes and rename UPF_FLAGS

UPF_FLAGS is confusing - rename it to UPF_CHANGE_MASK.
Add uart_update_timeout, uart_get_baud_rate and uart_get_divisor
prototypes.

drivers/serial/core.c

@@ -827,7 +827,7 @@ uart_set_info(struct uart_info *info, struct serial_struct *newinfo)
 
 	port->irq              = new_serial.irq;
 	port->uartclk          = new_serial.baud_base * 16;
-	port->flags            = new_serial.flags & UPF_FLAGS;
+	port->flags            = new_serial.flags & UPF_CHANGE_MASK;
 	port->custom_divisor   = new_serial.custom_divisor;
 	state->close_delay     = new_serial.close_delay * HZ / 100;
 	state->closing_wait    = new_serial.closing_wait * HZ / 100;

include/linux/serial_core.h

@@ -179,7 +179,7 @@ struct uart_port {
 #define UPF_RESOURCES		(1 << 30)
 #define UPF_IOREMAP		(1 << 31)
 
-#define UPF_FLAGS		(0x7fff)
+#define UPF_CHANGE_MASK		(0x7fff)
 #define UPF_USR_MASK		(UPF_SPD_MASK|UPF_LOW_LATENCY)
 
 	unsigned int		mctrl;			/* current modem ctrl settings */
@@ -275,12 +275,30 @@ struct uart_driver {
 };
 
 void uart_write_wakeup(struct uart_port *port);
+
+/*
+ * Baud rate helpers.
+ */
+void uart_update_timeout(struct uart_port *port, unsigned int cflag,
+			 unsigned int quot);
+unsigned int uart_get_baud_rate(struct uart_port *port,
+				struct termios *termios);
+unsigned int uart_get_divisor(struct uart_port *port, struct termios *termios,
+			      struct termios *old_termios);
+
+/*
+ * Console helpers.
+ */
 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 				   struct console *c);
 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 			int *flow);
 int uart_set_options(struct uart_port *port, struct console *co, int baud,
 		     int parity, int bits, int flow);
+
+/*
+ * Port/driver registration/removal
+ */
 int uart_register_driver(struct uart_driver *uart);
 void uart_unregister_driver(struct uart_driver *uart);
 void uart_unregister_port(struct uart_driver *reg, int line);