[v3,05/13] ARM: dts: rockchip: disable arm-global-timer for rk3188
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Message ID 1480427118-5126-6-git-send-email-al.kochet@gmail.com
State New
Headers show

Commit Message

Alexander Kochetkov Nov. 29, 2016, 1:45 p.m. UTC
arm-global-timer can provide clockevents, clocksource and shed_clock. But
on rk3188 platform it provide only clocksource and shed_clock. clockevents
from  arm-global-timer is not used by kernel because there is another
clockevent provider with higher rating (smp-twd).

My commit from the series implement clocksource and shed_clock using
rockchip_timer. But sched clock from rk_timer is not selected by kernel
due to lower frequency than arm-global-timer, and clocksource from
rk_timer is not selected by kernel due to lower rating than
arm-global-timer. And I don't want to increase clocksource rating
because ratings greater than 300 used for high frequency clocksources.

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

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
---
 arch/arm/boot/dts/rk3188.dtsi |    1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/arch/arm/boot/dts/rk3188.dtsi b/arch/arm/boot/dts/rk3188.dtsi
index 0dc52fe..44da3d42 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 {