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authorGeert Uytterhoeven <geert+renesas@glider.be>2016-04-14 11:08:09 +0200
committerJonathan Corbet <corbet@lwn.net>2016-04-15 15:59:06 -0600
commita3bedc3bdc6e640141157636e253d63279860e23 (patch)
treebbf1a96b92c20a6e1a5b9509144f9e55a2347e70 /Documentation/serial
parentd124fd3bb36ceb40438f10c897ce642386b74b72 (diff)
serial: doc: .(un)throttle() depends on hardware assisted flow control
Document that .throttle() and .unthrottle() are relevant only if hardware assisted flow control is enabled. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/serial')
-rw-r--r--Documentation/serial/driver2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index 03369d076ca2..03b703cf9318 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -135,6 +135,7 @@ hardware.
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.
+ This will be called only if hardware assisted flow control is enabled.
Locking: none.
@@ -142,6 +143,7 @@ hardware.
Notify the serial driver that characters can now be sent to the serial
port without fear of overrunning the input buffers of the line
disciplines.
+ This will be called only if hardware assisted flow control is enabled.
Locking: none.