Wasn't planning on sending this patch just yet, but oh well.
On 01/12/2016 11:41 AM, Peter Hurley wrote:
> 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@xxxxxxxxxxxxxxxxxx>
> ---
> 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 */
This patch may not apply because the context is sitting on top of
unsubmitted code. Sorry.
Regards,
Peter Hurley
> +
> +#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
>
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