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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 <eddie.huang@mediatek.com>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eddie Huang 2015-04-28 21:40:33 +08:00 committed by Greg Kroah-Hartman
parent 1c5841e832
commit 2c40b57dc8
1 changed files with 13 additions and 0 deletions
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13
drivers/tty/serial/8250/8250_mtk.c
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@ -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");