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Commit ea507ce3 authored by Paul Cercueil's avatar Paul Cercueil Committed by Greg Kroah-Hartman
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serial: 8250_ingenic: Parse earlycon options 



In the devicetree, it is possible to specify the baudrate, parity,
bits, flow of the early console, by passing a configuration string like
this:

aliases {
	serial0 = &uart0;
};

chosen {
	stdout-path = "serial0:57600n8";
};

This, for instance, will configure the early console for a baudrate of
57600 bps, no parity, and 8 bits per baud.

This patches implements parsing of this configuration string in the
8250_ingenic driver, which previously just ignored it.

Signed-off-by: default avatarPaul Cercueil <paul@crapouillou.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent aed3d701

drivers/tty/serial/8250/8250_ingenic.c

+10 −2
Original line number Diff line number Diff line
@@ -91,14 +91,22 @@ static int __init ingenic_early_console_setup(struct earlycon_device *dev, 
					      const char *opt)

{

	struct uart_port *port = &dev->port;

	unsigned int baud, divisor;

	unsigned int divisor;

	int baud = 115200;



	if (!dev->port.membase)

		return -ENODEV;



	if (opt) {

		unsigned int parity, bits, flow; /* unused for now */



		uart_parse_options(opt, &baud, &parity, &bits, &flow);

	}



	ingenic_early_console_setup_clock(dev);



	baud = dev->baud ?: 115200;

	if (dev->baud)

		baud = dev->baud;

	divisor = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud);



	early_out(port, UART_IER, 0);