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serial: doc: .(un)throttle() depends on hardware assisted flow control

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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>
This commit is contained in:
Geert Uytterhoeven 2016-04-14 11:08:09 +02:00 committed by Jonathan Corbet
parent d124fd3bb3
commit a3bedc3bdc
1 changed files with 2 additions and 0 deletions
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Documentation/serial/driver
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@ -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.