linux-kernel - [PATCH v5 19/21] MIPS: CI20: Reduce system timer clock to 3 MHz

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Message-Id: <20180724231958.20659-20-paul@crapouillou.net>
Date:   Wed, 25 Jul 2018 01:19:56 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Jonathan Corbet <corbet@....net>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Lee Jones <lee.jones@...aro.org>
Cc:     Paul Cercueil <paul@...pouillou.net>, 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
Subject: [PATCH v5 19/21] MIPS: CI20: Reduce system timer clock to 3 MHz

The default clock (48 MHz) is too fast for the system timer, which fails
to report time accurately.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 arch/mips/boot/dts/ingenic/ci20.dts | 6 ++++++
 1 file changed, 6 insertions(+)

 v5: New patch

diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 50cff3cbcc6d..700cf28a52ec 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -238,3 +238,9 @@
 		bias-disable;
 	};
 };
+
+&tcu {
+	/* 3 MHz for the system timer */
+	assigned-clocks = <&tcu TCU_CLK_TIMER0>;
+	assigned-clock-rates = <3000000>;
+};
-- 
2.11.0