serial: of-serial: fetch line number from DT

The general agreed way to specify a fixed line number
for a serial console is to provide a "serial" alias
in the devicetree. Start parsing this property in
of_serial.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c
index 8749fb8..7bc1634 100644 (file)
--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -102,6 +102,10 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
        if (of_property_read_u32(np, "fifo-size", &prop) == 0)
                port->fifosize = prop;
 
+       /* Check for a fixed line number */
+       if ((ret = of_alias_get_id(np, "serial")) >= 0)
+               port->line = ret;
+
        port->irq = irq_of_parse_and_map(np, 0);
        port->iotype = UPIO_MEM;
        if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {