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-rw-r--r--Documentation/serial/serial-rs485.txt9
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/serial/serial-rs485.txt b/Documentation/serial/serial-rs485.txt
index a3b1af7b6db9..a4932387bbfb 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