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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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3
hw/core/clock.c
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@ -81,6 +81,9 @@ static void clock_propagate_period(Clock *clk, bool call_callbacks)
QLIST_FOREACH(child, &clk->children, sibling) {
if (child->period != clk->period) {
if (call_callbacks) {
clock_call_callback(child, ClockPreUpdate);
}
child->period = clk->period;
trace_clock_update(CLOCK_PATH(child), CLOCK_PATH(clk),
CLOCK_PERIOD_TO_HZ(clk->period),