linux-kernel - [PATCH v15 10/13] MIPS: qi_lb60: Reduce system timer and clocksource to 750 kHz

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Message-Id: <20190724171615.20774-11-paul@crapouillou.net>
Date:   Wed, 24 Jul 2019 13:16:12 -0400
From:   Paul Cercueil <paul@...pouillou.net>
To:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Lee Jones <lee.jones@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-clk@...r.kernel.org, od@...c.me,
        Mathieu Malaterre <malat@...ian.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Artur Rojek <contact@...ur-rojek.eu>
Subject: [PATCH v15 10/13] 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>
Tested-by: Mathieu Malaterre <malat@...ian.org>
Tested-by: Artur Rojek <contact@...ur-rojek.eu>
---

Notes:
    v5: New patch
    
    v6: Remove ingenic,clocksource-channel property
    
    v7-v15: No change

 arch/mips/boot/dts/ingenic/qi_lb60.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/mips/boot/dts/ingenic/qi_lb60.dts b/arch/mips/boot/dts/ingenic/qi_lb60.dts
index cc26650562c2..933d98ca8d93 100644
--- a/arch/mips/boot/dts/ingenic/qi_lb60.dts
+++ b/arch/mips/boot/dts/ingenic/qi_lb60.dts
@@ -2,6 +2,7 @@
 /dts-v1/;
 
 #include "jz4740.dtsi"
+#include <dt-bindings/clock/ingenic,tcu.h>
 #include <dt-bindings/gpio/gpio.h>
 
 / {
@@ -64,3 +65,9 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pins_mmc>;
 };
+
+&tcu {
+	/* 750 kHz for the system timer and clocksource */
+	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
+	assigned-clock-rates = <750000>, <750000>;
+};
-- 
2.21.0.593.g511ec345e18