linux-kernel - [PATCH 20/36] RS485 documentation: add 16C950 UART description

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Date:	Thu,  6 Jan 2011 14:23:09 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Yegor Yefremov <yegor_sub1@...ionsystems.de>,
	Yegor Yefremov <yegorslists@...glemail.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 20/36] RS485 documentation: add 16C950 UART description

From: Yegor Yefremov <yegor_sub1@...ionsystems.de>

Add a notion about 16C950 UART, that is using DTR signal for RS485 mode.

Signed-off-by: Yegor Yefremov <yegorslists@...glemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 Documentation/serial/serial-rs485.txt |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Documentation/serial/serial-rs485.txt b/Documentation/serial/serial-rs485.txt
index a3b1af7..a493238 100644
--- a/Documentation/serial/serial-rs485.txt
+++ b/Documentation/serial/serial-rs485.txt
@@ -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
-- 
1.7.3.2

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