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clock: Add ClockPreUpdate callback event type

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Add a new callback event type ClockPreUpdate, which is called on
period changes before the period is updated.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20210219144617.4782-3-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-02-19 14:45:35 +00:00
parent 5ee0abed51
commit e4341623a3
3 changed files with 12 additions and 1 deletions
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9
docs/devel/clocks.rst
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@ -181,7 +181,14 @@ events.
The events currently supported are:
* ``ClockUpdate`` : called after the input clock's period has changed
* ``ClockPreUpdate`` : called when the input clock's period is about to
update. This is useful if the device needs to do some action for
which it needs to know the old value of the clock period. During
this callback, Clock API functions like ``clock_get()`` or
``clock_ticks_to_ns()`` will use the old period.
* ``ClockUpdate`` : called after the input clock's period has changed.
During this callback, Clock API functions like ``clock_ticks_to_ns()``
will use the new period.
Note that a clock only has one callback: it is not possible to register
different functions for different events. You must register a single