serial: earlycon: Refactor parse_options into serial core

Prepare to support console-defined matching; refactor the command
line parameter string processing from parse_options() into a
new core function, uart_parse_earlycon(), which decodes command line
parameters of the form:
   earlycon=<name>,io|mmio|mmio32,<addr>,<options>
   console=<name>,io|mmio|mmio32,<addr>,<options>
   earlycon=<name>,0x<addr>,<options>
   console=<name>,0x<addr>,<options>

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index baf3e1d08416..cc5c506f07dd 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -354,6 +354,8 @@ early_param("earlycon", name ## _setup_earlycon);
 
 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
                                    struct console *c);
+int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+                        char **options);
 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,