atmel_serial: RS485: receiving enabled when sending data

By default the atmel_serial driver in RS485 mode disables receiving data until
all data in the send buffer has been sent. This flag allows to receive data
even whilst sending data.

Signed-off-by: Bernhard Roth <br@pwrnet.de>
Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/Documentation/serial/serial-rs485.txt b/Documentation/serial/serial-rs485.txt
index a4932387bbfb..c8878f821d1e 100644
--- a/Documentation/serial/serial-rs485.txt
+++ b/Documentation/serial/serial-rs485.txt
@@ -104,6 +104,9 @@
         rs485conf.flags |= SER_RS485_RTS_AFTER_SEND;
         rs485conf.delay_rts_after_send = ...;
 
+        /* Set this flag if you want to receive data even whilst sending data */
+        rs485conf.flags |= SER_RS485_RX_DURING_TX;
+
         if (ioctl (fd, TIOCSRS485, &rs485conf) < 0) {
                 /* Error handling. See errno. */
         }