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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: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Paul Cercueil 2017-12-28 14:07:09 +01:00 committed by Greg Kroah-Hartman
parent aed3d7012c
commit ea507ce3e0
1 changed files with 10 additions and 2 deletions
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12
drivers/tty/serial/8250/8250_ingenic.c
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@ -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);