From ea507ce3e05a462e170db4b6af1002fb0ed72916 Mon Sep 17 00:00:00 2001 From: Paul Cercueil Date: Thu, 28 Dec 2017 14:07:09 +0100 Subject: 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 Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_ingenic.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'drivers/tty') diff --git a/drivers/tty/serial/8250/8250_ingenic.c b/drivers/tty/serial/8250/8250_ingenic.c index 165b4bb3de93..15a8c8dfa92b 100644 --- a/drivers/tty/serial/8250/8250_ingenic.c +++ b/drivers/tty/serial/8250/8250_ingenic.c @@ -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); -- cgit v1.2.3