console: Set Linux console parameter automatically

Linux specifies the linux,stdout-path property in the /chosen node
in the devicetree. Unfortunately this is ignored in most cases.
For cases in which barebox uses this property for its own use we
translate this into a Linux boot arg with:

- the console name provided by the serial driver
- the the instance from the 'serial' alias
- the baudrate from the actual baudrate.

So with this it's for devicetee enabled boards no longer necessary
to manually assign a console= parameter. Should a user not want
to use the automatically assigned parameter it should do:

global.linux.bootargs.console=

in the environment.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/serial/serial_imx.c b/drivers/serial/serial_imx.c
index 8468fa0adc..e0bd185c8b 100644
--- a/drivers/serial/serial_imx.c
+++ b/drivers/serial/serial_imx.c
@@ -336,6 +336,7 @@ static int imx_serial_probe(struct device_d *dev)
 	cdev->getc = imx_serial_getc;
 	cdev->flush = imx_serial_flush;
 	cdev->setbrg = imx_serial_setbaudrate;
+	cdev->linux_console_name = "ttymxc";
 
 	imx_serial_init_port(cdev);
 
diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index a8487b0ed3..f1da44b7f7 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -57,6 +57,7 @@ static inline struct ns16550_priv *to_ns16550_priv(struct console_device *cdev)
 
 struct ns16550_drvdata {
 	void (*init_port)(struct console_device *cdev);
+	const char *linux_console_name;
 };
 
 /**
@@ -251,6 +252,7 @@ static struct ns16550_drvdata ns16550_drvdata = {
 
 static __maybe_unused struct ns16550_drvdata omap_drvdata = {
 	.init_port = ns16550_omap_init_port,
+	.linux_console_name = "ttyO",
 };
 
 /**
@@ -312,6 +314,7 @@ static int ns16550_probe(struct device_d *dev)
 	cdev->putc = ns16550_putc;
 	cdev->getc = ns16550_getc;
 	cdev->setbrg = ns16550_setbaudrate;
+	cdev->linux_console_name = devtype->linux_console_name;
 
 	devtype->init_port(cdev);