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ARM: dts: rockchip: disable arm_global_timer on rk3066 and rk3188

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[ Upstream commit da74858a47 ]

The clock source and the sched_clock provided by the arm_global_timer
on Rockchip rk3066a/rk3188 are quite unstable because their rates
depend on the CPU frequency.

Recent changes to the arm_global_timer driver makes it impossible to use.

On the other side, the arm_global_timer has a higher rating than the
ROCKCHIP_TIMER, it will be selected by default by the time framework
while we want to use the stable Rockchip clock source.

Keep the arm_global_timer disabled in order to have the
DW_APB_TIMER (rk3066a) or ROCKCHIP_TIMER (rk3188) selected by default.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/f275ca8d-fd0a-26e5-b978-b7f3df815e0a@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johan Jonker 2022-10-30 21:56:29 +01:00 • committed by Justin Hammond
parent 2de637986b
commit 671630f7f7
2 changed files with 7 additions and 1 deletions
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1
arch/arm/boot/dts/rk3188.dtsi
View file

@ -606,7 +606,6 @@
&global_timer {
interrupts = <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_EDGE_RISING)>;
status = "disabled";
};
&local_timer {

7
arch/arm/boot/dts/rk3xxx.dtsi
View file

@ -76,6 +76,13 @@
reg = <0x1013c200 0x20>;
interrupts = <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_EDGE_RISING)>;
clocks = <&cru CORE_PERI>;
status = "disabled";
/* The clock source and the sched_clock provided by the arm_global_timer
* on Rockchip rk3066a/rk3188 are quite unstable because their rates
* depend on the CPU frequency.
* Keep the arm_global_timer disabled in order to have the
* DW_APB_TIMER (rk3066a) or ROCKCHIP_TIMER (rk3188) selected by default.
*/
};
local_timer: local-timer@1013c600 {