Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752633AbdGBQco (ORCPT ); Sun, 2 Jul 2017 12:32:44 -0400 Received: from outils.crapouillou.net ([89.234.176.41]:39474 "EHLO crapouillou.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751682AbdGBQad (ORCPT ); Sun, 2 Jul 2017 12:30:33 -0400 From: Paul Cercueil To: Ralf Baechle , Michael Turquette , Stephen Boyd , Rob Herring Cc: Paul Burton , Maarten ter Huurne , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@linux-mips.org, linux-clk@vger.kernel.org, Paul Cercueil Subject: [PATCH v3 09/18] serial: 8250_ingenic: Parse earlycon options Date: Sun, 2 Jul 2017 18:30:07 +0200 Message-Id: <20170702163016.6714-10-paul@crapouillou.net> In-Reply-To: <20170702163016.6714-1-paul@crapouillou.net> References: <20170607200439.24450-2-paul@crapouillou.net> <20170702163016.6714-1-paul@crapouillou.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1589 Lines: 57 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(-) v2: Don't create temp. buffer, now that uart_parse_options takes a const char* v3: No change 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