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> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Lucas Stach · Greg Kroah-Hartman · Eric Lee · Eric Lee · Eric Lee · Eric Lee
1 parent c3bda295ee
Showing 1 changed file with 5 additions and 0 deletions Side-by-side Diff
drivers/tty/serial/of_serial.c
@@ -102,6 +102,11 @@
 	if (of_property_read_u32(np, "fifo-size", &prop) == 0)
 		port->fifosize = prop;
  
+	/* Check for a fixed line number */
+	ret = of_alias_get_id(np, "serial");
+	if (ret >= 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) {
...	...	@@ -102,6 +102,11 @@
102	102	if (of_property_read_u32(np, "fifo-size", &prop) == 0)
103	103	port->fifosize = prop;
104	104
	105	+ /* Check for a fixed line number */
	106	+ ret = of_alias_get_id(np, "serial");
	107	+ if (ret >= 0)
	108	+ port->line = ret;
	109	+
105	110	port->irq = irq_of_parse_and_map(np, 0);
106	111	port->iotype = UPIO_MEM;
107	112	if (of_property_read_u32(np, "reg-io-width", &prop) == 0) {