From 2c40b57dc82de8e1337666341efe41a0fe9dd741 Mon Sep 17 00:00:00 2001 From: Eddie Huang Date: Tue, 28 Apr 2015 21:40:33 +0800 Subject: [PATCH] tty: serial: 8250_mtk: Add earlycon Add 8250 MTK UART driver to support earlycon device tree. Earlycon take effect by add "earlycon" in kernel boot argument add "linux,sdtout-path" property in device tree file Signed-off-by: Eddie Huang Tested-by: Sascha Hauer Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_mtk.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 8eb3876563f1..4488c2bdb7ba 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -305,6 +305,19 @@ static struct platform_driver mtk8250_platform_driver = { }; module_platform_driver(mtk8250_platform_driver); +static int __init early_mtk8250_setup(struct earlycon_device *device, + const char *options) +{ + if (!device->port.membase) + return -ENODEV; + + device->port.iotype = UPIO_MEM32; + + return early_serial8250_setup(device, NULL); +} + +OF_EARLYCON_DECLARE(mtk8250, "mediatek,mt6577-uart", early_mtk8250_setup); + MODULE_AUTHOR("Matthias Brugger"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Mediatek 8250 serial port driver");