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serial: core: Support common rs485 binding for RTS polarity

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When a driver invokes the uart_get_rs485_mode() helper, set the RTS
polarity to active high by default unless the newly introduced
"rs485-rts-active-low" property was specified.

imx contains a line to set the default RTS polarity to active high,
it is now superfluous and hence deleted.

omap-serial historically defaults to active low and supports an
"rs485-rts-active-high" property to inverse the polarity.
Retain that behavior for compatibility.

Cc: Mark Jackson <mpfj@newflow.co.uk>
Cc: Michał Oleszczyk <oleszczyk.m@gmail.com>
Cc: Rafael Gago Castano <rgc@hms.se>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner
2017-11-24 23:26:40 +01:00
committed by Greg Kroah-Hartman
parent 6abe9ea8a5
commit f1e5b618c1
3 changed files with 15 additions and 6 deletions
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1
drivers/tty/serial/imx.c
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@@ -2060,7 +2060,6 @@ static int serial_imx_probe(struct platform_device *pdev)
sport->port.fifosize = 32;
sport->port.ops = &imx_pops;
sport->port.rs485_config = imx_rs485_config;
sport->port.rs485.flags |= SER_RS485_RTS_ON_SEND;
sport->port.flags = UPF_BOOT_AUTOCONF;
timer_setup(&sport->timer, imx_timeout, 0);