From e4341623a3b87e7eca87d42b7b88da967cd21c49 Mon Sep 17 00:00:00 2001
From: Peter Maydell
Date: Fri, 19 Feb 2021 14:45:35 +0000
Subject: clock: Add ClockPreUpdate callback event type

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
---
 hw/core/clock.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'hw/core')

diff --git a/hw/core/clock.c b/hw/core/clock.c
index 4479eff145..fc5a99683f 100644
--- a/hw/core/clock.c
+++ b/hw/core/clock.c
@@ -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),
-- 
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