diff options
| author |   Paul Cercueil <paul@crapouillou.net> | 2017-12-28 14:07:09 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-09 16:49:14 +0100 |
| commit | ea507ce3e05a462e170db4b6af1002fb0ed72916 (patch) | |
| tree | 3c6882dc0f651337d8677ae719e468f7e73f046b /drivers/tty | |
| parent | serial: 8250_ingenic: Add support for the JZ4770 SoC (diff) | |
| download | linux-dev-ea507ce3e05a462e170db4b6af1002fb0ed72916.tar.xz linux-dev-ea507ce3e05a462e170db4b6af1002fb0ed72916.zip | |
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_ingenic.c | 12 |
1 files changed, 10 insertions, 2 deletions
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); |