linux-kernel - [PATCH v7 21/24] MIPS: qi_lb60: Reduce system timer and clocksource to 750 kHz

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Message-Id: <20180821171834.22995-1-paul@crapouillou.net>
Date:   Tue, 21 Aug 2018 19:18:34 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Jonathan Corbet <corbet@....net>
Cc:     od@...c.me, Mathieu Malaterre <malat@...ian.org>,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
        linux-mips@...ux-mips.org, linux-doc@...r.kernel.org,
        linux-clk@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v7 21/24] MIPS: qi_lb60: Reduce system timer and clocksource to 750 kHz

The default clock (12 MHz) is too fast for the system timer, which fails
to report time accurately.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---

Notes:
     v5: New patch
    
     v6: Remove ingenic,clocksource-channel property
    
     v7: No change

 arch/mips/boot/dts/ingenic/qi_lb60.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/mips/boot/dts/ingenic/qi_lb60.dts b/arch/mips/boot/dts/ingenic/qi_lb60.dts
index 85529a142409..de9d45e2c24a 100644
--- a/arch/mips/boot/dts/ingenic/qi_lb60.dts
+++ b/arch/mips/boot/dts/ingenic/qi_lb60.dts
@@ -45,3 +45,9 @@
 		bias-disable;
 	};
 };
+
+&tcu {
+	/* 750 kHz for the system timer and clocksource */
+	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
+	assigned-clock-rates = <750000>, <750000>;
+};
-- 
2.11.0