linux-kernel - [PATCH v5 18/21] MIPS: qi_lb60: Use 750 kHz system timer & enable clocksource

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Message-Id: <20180724231958.20659-19-paul@crapouillou.net>
Date:   Wed, 25 Jul 2018 01:19:55 +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 18/21] MIPS: qi_lb60: Use 750 kHz system timer & enable clocksource

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>
---
 arch/mips/boot/dts/ingenic/qi_lb60.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

 v5: New patch

diff --git a/arch/mips/boot/dts/ingenic/qi_lb60.dts b/arch/mips/boot/dts/ingenic/qi_lb60.dts
index 85529a142409..5d2aca867427 100644
--- a/arch/mips/boot/dts/ingenic/qi_lb60.dts
+++ b/arch/mips/boot/dts/ingenic/qi_lb60.dts
@@ -45,3 +45,12 @@
 		bias-disable;
 	};
 };
+
+&tcu {
+	/* Use TCU1 channel as clocksource */
+	ingenic,clocksource-channel = <1>;
+
+	/* 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