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    Subject[PATCH v4 11/11] serial: 8250_omap: Add omap8250 earlycon
    Date
    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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