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-rw-r--r--Documentation/tty.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/tty.txt b/Documentation/tty.txt
index 048a8762cfb..8e65c4498c5 100644
--- a/Documentation/tty.txt
+++ b/Documentation/tty.txt
@@ -132,6 +132,14 @@ set_termios() Notify the tty driver that the device's termios
tty->termios. Previous settings should be passed in
the "old" argument.
+ The API is defined such that the driver should return
+ the actual modes selected. This means that the
+ driver function is responsible for modifying any
+ bits in the request it cannot fulfill to indicate
+ the actual modes being used. A device with no
+ hardware capability for change (eg a USB dongle or
+ virtual port) can provide NULL for this method.
+
throttle() Notify the tty driver that input buffers for the
line discipline are close to full, and it should
somehow signal that no more characters should be