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clock: Add ClockEvent parameter to callbacks

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The Clock framework allows users to specify a callback which is
called after the clock's period has been updated.  Some users need to
also have a callback which is called before the clock period is
updated.

As the first step in adding support for notifying Clock users on
pre-update events, add an argument to the ClockCallback to specify
what event is being notified, and add an argument to the various
functions for registering a callback to specify which events are
of interest to that callback.

Note that the documentation update renders correct the previously
incorrect claim in 'Adding a new clock' that callbacks "will be
explained in a following section".

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210219144617.4782-2-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-02-19 14:45:34 +00:00
parent 0436c55edf
commit 5ee0abed51
20 changed files with 161 additions and 58 deletions
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4
hw/timer/cmsdk-apb-timer.c
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@ -204,7 +204,7 @@ static void cmsdk_apb_timer_reset(DeviceState *dev)
ptimer_transaction_commit(s->timer);
}
static void cmsdk_apb_timer_clk_update(void *opaque)
static void cmsdk_apb_timer_clk_update(void *opaque, ClockEvent event)
{
CMSDKAPBTimer *s = CMSDK_APB_TIMER(opaque);
@ -223,7 +223,7 @@ static void cmsdk_apb_timer_init(Object *obj)
sysbus_init_mmio(sbd, &s->iomem);
sysbus_init_irq(sbd, &s->timerint);
s->pclk = qdev_init_clock_in(DEVICE(s), "pclk",
cmsdk_apb_timer_clk_update, s);
cmsdk_apb_timer_clk_update, s, ClockUpdate);
}
static void cmsdk_apb_timer_realize(DeviceState *dev, Error **errp)