1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/serial/serial-rs485.txt b/Documentation/serial/serial-rs485.txt
index a4932387bbfb..079cb3df62cf 100644
--- a/Documentation/serial/serial-rs485.txt
+++ b/Documentation/serial/serial-rs485.txt
@@ -28,6 +28,10 @@
    RS485 communications. This data structure is used to set and configure RS485
    parameters in the platform data and in ioctls.
 
+   The device tree can also provide RS485 boot time parameters (see [2]
+   for bindings). The driver is in charge of filling this data structure from
+   the values given by the device tree.
+
    Any driver for devices capable of working both as RS232 and RS485 should
    provide at least the following ioctls:
 
@@ -104,6 +108,9 @@
         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. */
         }
@@ -118,3 +125,4 @@
 5. REFERENCES
 
  [1]    include/linux/serial.h
+ [2]    Documentation/devicetree/bindings/serial/rs485.txt