linux-kernel - [PATCH v1 2/2] ARM: dts: rockchip: rk3066a: disable arm_global

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Date:   Sun, 30 Oct 2022 19:37:01 +0100
From:   Johan Jonker <jbx6244@...il.com>
To:     heiko@...ech.de
Cc:     linux@...linux.org.uk, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH v1 2/2] ARM: dts: rockchip: rk3066a: disable arm_global_timer

The clocksource 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 clocksource.

Let's disable the arm_global_timer in order to have the DW_APB_TIMER
(rk3066a) selected by default.

Signed-off-by: Johan Jonker <jbx6244@...il.com>
---

ARM: dts: rockchip: disable arm-global-timer for rk3188
https://lore.kernel.org/linux-rockchip/1492374441-23336-26-git-send-email-daniel.lezcano@linaro.org/

clocksource: arm_global_timer: implement rate compensation whenever source clock changes
https://lore.kernel.org/all/20210406130045.15491-2-andrea.merello@gmail.com/
---
 arch/arm/boot/dts/rk3066a.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/rk3066a.dtsi b/arch/arm/boot/dts/rk3066a.dtsi
index de9915d94..cf8045625 100644
--- a/arch/arm/boot/dts/rk3066a.dtsi
+++ b/arch/arm/boot/dts/rk3066a.dtsi
@@ -653,6 +653,10 @@
 	};
 };

+&global_timer {
+	status = "disabled";
+};
+
 &gpu {
 	compatible = "rockchip,rk3066-mali", "arm,mali-400";
 	interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
--
2.20.1