Messages in this thread Patch in this message | | | From | Peter Hurley <> | Subject | [PATCH v4 11/11] serial: 8250_omap: Add omap8250 earlycon | Date | Tue, 12 Jan 2016 11:41:12 -0800 |
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Add DT earlycon for 8250_omap driver. This boot console is included for kernels built with CONFIG_SERIAL_EARLYCON=y, CONFIG_OF=y, CONFIG_SERIAL_8250_OMAP=y, and CONFIG_OF_EARLY_FLATTREE=y.
This boot console is enabled with the command line option "earlycon" (without "=<name>...") when the DT 'stdout-path' property matches a compatible uart. For example,
/ { chosen { stdout-path = "serial0:115200"; };
....
aliases { serial0 = &uart0; };
....
ocp : ocp { uart0 : serial@44e09000 { compatible = "ti,omap3-uart"; } }; };
Signed-off-by: Peter Hurley <peter@hurleysoftware.com> --- drivers/tty/serial/8250/8250_early.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index e7cdc0c..d1f6310 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -201,3 +201,23 @@ EARLYCON_DECLARE(rt288x, early_rt288x_setup); OF_EARLYCON_DECLARE(rt288x, "ralink,rt2880-uart", early_rt288x_setup); #endif /* CONFIG_SERIAL_8250_RT288X */ + +#ifdef CONFIG_SERIAL_8250_OMAP + +static int __init early_omap8250_setup(struct earlycon_device *device, + const char *options) +{ + struct uart_port *port = &device->port; + + if (!(device->port.membase || device->port.iobase)) + return -ENODEV; + + port->regshift = 2; + device->con->write = early_serial8250_write; + return 0; +} + +OF_EARLYCON_DECLARE(omap8250, "ti,omap2-uart", early_omap8250_setup); +OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup); +OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup); +#endif -- 2.7.0
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