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-rw-r--r--Documentation/tty.txt8
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diff --git a/Documentation/tty.txt b/Documentation/tty.txt
index 048a8762cfb5..8e65c4498c52 100644
--- a/Documentation/tty.txt
+++ b/Documentation/tty.txt
@@ -132,6 +132,14 @@ set_termios() Notify the tty driver that the device's termios
132 tty->termios. Previous settings should be passed in 132 tty->termios. Previous settings should be passed in
133 the "old" argument. 133 the "old" argument.
134 134
135 The API is defined such that the driver should return
136 the actual modes selected. This means that the
137 driver function is responsible for modifying any
138 bits in the request it cannot fulfill to indicate
139 the actual modes being used. A device with no
140 hardware capability for change (eg a USB dongle or
141 virtual port) can provide NULL for this method.
142
135throttle() Notify the tty driver that input buffers for the 143throttle() Notify the tty driver that input buffers for the
136 line discipline are close to full, and it should 144 line discipline are close to full, and it should
137 somehow signal that no more characters should be 145 somehow signal that no more characters should be