Commit da74858a authored by Johan Jonker's avatar Johan Jonker Committed by Heiko Stuebner
Browse files

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



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: default avatarJohan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/f275ca8d-fd0a-26e5-b978-b7f3df815e0a@gmail.com


Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
parent 9abf2313

arch/arm/boot/dts/rk3188.dtsi

+0 −1
Original line number Diff line number Diff line
@@ -607,7 +607,6 @@ 


&global_timer {

	interrupts = <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_EDGE_RISING)>;

	status = "disabled";

};



&local_timer {

arch/arm/boot/dts/rk3xxx.dtsi

+7 −0
Original line number Diff line number Diff line
@@ -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 {