From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Cercueil Subject: [PATCH 3/3] serial: 8250_ingenic: Parse earlycon options Date: Thu, 28 Dec 2017 14:07:09 +0100 Message-ID: <20171228130709.12457-4-paul@crapouillou.net> References: <20171228130709.12457-1-paul@crapouillou.net> Return-path: In-Reply-To: <20171228130709.12457-1-paul@crapouillou.net> Sender: linux-kernel-owner@vger.kernel.org To: Greg Kroah-Hartman Cc: Rob Herring , linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Cercueil List-Id: linux-serial@vger.kernel.org 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 --- drivers/tty/serial/8250/8250_ingenic.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) v1: Initial version 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); -- 2.15.1