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    Subject[PATCH 20/36] RS485 documentation: add 16C950 UART description
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    From: Yegor Yefremov <yegor_sub1@visionsystems.de>

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

    Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.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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