From 75d611bf01737d8456093804377e5cb0a60a9038 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sat, 16 Jan 2016 15:23:49 -0800 Subject: [PATCH] serial: 8250_omap: Add omap8250 earlycon 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 "=...") 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 Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_early.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index 180143ce77ce..3b3dbdc1b73e 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -149,3 +149,24 @@ EARLYCON_DECLARE(uart8250, early_serial8250_setup); EARLYCON_DECLARE(uart, early_serial8250_setup); OF_EARLYCON_DECLARE(ns16550, "ns16550", early_serial8250_setup); OF_EARLYCON_DECLARE(ns16550a, "ns16550a", early_serial8250_setup); + +#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 -- GitLab