Commit:     3ac40b9b5e62528d407e0e780b65c21c0247bc7c
Parent:     05a462afe80553550bc77afc724ce60b42ad587e
Author:     Alan Cox <[EMAIL PROTECTED]>
AuthorDate: Wed Nov 28 16:21:28 2007 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Nov 29 09:24:52 2007 -0800

    termios: document callback more clearly
    Signed-off-by: Alan Cox <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 Documentation/tty.txt |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/Documentation/tty.txt b/Documentation/tty.txt
index 048a876..8e65c44 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
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