[PATCH v2 08/17] serial: 8250_ingenic: Parse earlycon options

[Paul Cercueil]

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 <p...@crapouillou.net>
---
 drivers/tty/serial/8250/8250_ingenic.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

 v2: Don't create temp. buffer, now that uart_parse_options takes a const char*

diff --git a/drivers/tty/serial/8250/8250_ingenic.c 
b/drivers/tty/serial/8250/8250_ingenic.c
index b31b2ca552d1..be4a07a24342 100644
--- a/drivers/tty/serial/8250/8250_ingenic.c
+++ b/drivers/tty/serial/8250/8250_ingenic.c
@@ -99,14 +99,22 @@ 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);
-- 
2.11.0