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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>
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@ -135,6 +135,7 @@ hardware.
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Notify the serial driver that input buffers for the line discipline are
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close to full, and it should somehow signal that no more characters
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should be sent to the serial port.
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This will be called only if hardware assisted flow control is enabled.
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Locking: none.
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@ -142,6 +143,7 @@ hardware.
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Notify the serial driver that characters can now be sent to the serial
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port without fear of overrunning the input buffers of the line
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disciplines.
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This will be called only if hardware assisted flow control is enabled.
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Locking: none.
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