From: Yegor Yefremov <yegor_sub1@visionsystems.de>
To: linux-serial@vger.kernel.org
Cc: gregkh@suse.de, claudio@evidence.eu.com
Subject: [PATCH] RS485 documentation: add 16C950 UART description
Date: Mon, 22 Nov 2010 11:06:32 +0100 [thread overview]
Message-ID: <4CEA40A8.5090401@visionsystems.de> (raw)
Add a notion about 16C950 UART, that is using DTR signal for RS485 mode.
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Index: b/Documentation/serial/serial-rs485.txt
===================================================================
--- a/Documentation/serial/serial-rs485.txt 2010-11-19 03:48:08.000000000 +0100
+++ b/Documentation/serial/serial-rs485.txt 2010-11-19 10:42:22.000000000 +0100
@@ -11,10 +11,11 @@
2. HARDWARE-RELATED CONSIDERATIONS
- Some CPUs (e.g., Atmel AT91) contain a built-in half-duplex mode capable of
- automatically controlling line direction by toggling RTS. That can used to
- control external half-duplex hardware like an RS485 transceiver or any
- RS232-connected half-duplex device like some modems.
+ Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-in
+ half-duplex mode capable of automatically controlling line direction by
+ toggling RTS or DTR signals. That can be used to control external
+ half-duplex hardware like an RS485 transceiver or any RS232-connected
+ half-duplex devices like some modems.
For these microcontrollers, the Linux driver should be made capable of
working in both modes, and proper ioctls (see later) should be made
reply other threads:[~2010-11-22 10:06 UTC|newest]
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