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-rw-r--r--Documentation/serial/driver7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index 61d520dea4c6..50f3d94ed50b 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -126,6 +126,13 @@ hardware.
Interrupts: locally disabled.
This call must not sleep
+ throttle(port)
+ Notify the serial driver that input buffers for the line discipline are
+ close to full, and it should somehow signal that no more characters
+ should be sent to the serial port.
+
+ Locking: none.
+
send_xchar(port,ch)
Transmit a high priority character, even if the port is stopped.
This is used to implement XON/XOFF flow control and tcflow(). If