linux-kernel - [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188

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Message-Id: <1485866596-32254-6-git-send-email-al.kochet@gmail.com>
Date:   Tue, 31 Jan 2017 15:43:16 +0300
From:   Alexander Kochetkov <al.kochet@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Caesar Wang <wxt@...k-chips.com>,
        Huang Tao <huangtao@...k-chips.com>,
        Alexander Kochetkov <al.kochet@...il.com>
Subject: [PATCH v6 5/5] ARM: dts: rockchip: disable arm-global-timer for rk3188

The clocksource and the sched_clock provided by the arm_global_timer
are quite unstable because their rates depend on the cpu frequency.

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 rockchip
clocksource selected by default.

Signed-off-by: Alexander Kochetkov <al.kochet@...il.com>
---
 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 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 {
-- 
1.7.9.5