[PATCH v5 4/8] ARM: dts: rockchip: disable arm-global-timer for rk3188

Alexander Kochetkov al.kochet at gmail.com
Tue Jan 24 04:16:39 PST 2017

clocksource and shed_clock provided by arm-global-timer is quite
unstable, because their rate depends on cpu frequency.
So disable arm-global-timer and use clocksource and sched_clock
from rockchip_timer.

It is impossible get stable clocksource having rockchip_timer and
arm-global-timer enabled at the same time. Because arm-global-timer
looks like a better candidate for the kernel: it has higher
frequency and rating.

Disabling arm-global-timer doesn't leave kernel without
clockevents as there is another clockevent provider (smp-twd).

Signed-off-by: Alexander Kochetkov <al.kochet at gmail.com>
Reviwed-by: Heiko Stübner <heiko at sntech.de>
 arch/arm/boot/dts/rk3188.dtsi |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index bcf8e03..f677130 100644
--- a/arch/arm/boot/dts/rk3188.dtsi
+++ b/arch/arm/boot/dts/rk3188.dtsi
@@ -546,6 +546,7 @@
 &global_timer {
 	interrupts = <GIC_PPI 11 0xf04>;
+	status = "disabled";
 &local_timer {

More information about the Linux-rockchip mailing list