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clocksource: dw_apb_timer_of: Fix missing clockevent timers 

[ Upstream commit 6d2e16a318 ]

Commit 1002148899 ("clocksource: dw_apb_timer_of: use
clocksource_of_init") replaced a publicly available driver
initialization method with one called by the timer_probe() method
available after CLKSRC_OF. In current implementation it traverses
all the timers available in the system and calls their initialization
methods if corresponding devices were either in dtb or in acpi. But
if before the commit any number of available timers would be installed
as clockevent and clocksource devices, after that there would be at most
two. The rest are just ignored since default case branch doesn't do
anything. I don't see a reason of such behaviour, neither the commit
message explains it. Moreover this might be wrong if on some platforms
these timers might be used for different purpose, as virtually CPU-local
clockevent timers and as an independent broadcast timer. So in order
to keep the compatibility with the platforms where the order of the
timers detection has some meaning, lets add the secondly discovered
timer to be of clocksource/sched_clock type, while the very first and
the others would provide the clockevents service.

Fixes: 1002148899 ("clocksource: dw_apb_timer_of: use clocksource_of_init")
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200521204818.25436-7-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Serge Semin 2020-05-21 23:48:15 +03:00 committed by Greg Kroah-Hartman
parent 7bd6569845
commit bffe2c8e23
1 changed files with 2 additions and 4 deletions
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6
drivers/clocksource/dw_apb_timer_of.c
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@ -147,10 +147,6 @@ static int num_called;
static int __init dw_apb_timer_init(struct device_node *timer)
{
switch (num_called) {
case 0:
pr_debug("%s: found clockevent timer\n", __func__);
add_clockevent(timer);
break;
case 1:
pr_debug("%s: found clocksource timer\n", __func__);
add_clocksource(timer);
@ -161,6 +157,8 @@ static int __init dw_apb_timer_init(struct device_node *timer)
#endif
break;
default:
pr_debug("%s: found clockevent timer\n", __func__);
add_clockevent(timer);
break;
}