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Commit 2c40b57d authored by Eddie Huang's avatar Eddie Huang Committed by Greg Kroah-Hartman
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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: default avatarEddie Huang <eddie.huang@mediatek.com>
Tested-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1c5841e8

drivers/tty/serial/8250/8250_mtk.c

+13 −0
Original line number Diff line number Diff line
@@ -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");