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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>
This commit is contained in:
Lucas Stach 2014-11-03 23:16:54 +01:00 committed by Greg Kroah-Hartman
parent 5d14bba91d
commit 1bd8324535
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/of_serial.c
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@ -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) {