linux-kernel - [PATCH v14 10/13] MIPS: qi_lb60: Reduce system timer and clocksource to 750 kHz

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Message-Id: <20190701151410.23127-11-paul@crapouillou.net>
Date:   Mon,  1 Jul 2019 17:14:07 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Lee Jones <lee.jones@...aro.org>, Jonathan Corbet <corbet@....net>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Mathieu Malaterre <malat@...ian.org>, od@...c.me,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-clk@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>,
        Artur Rojek <contact@...ur-rojek.eu>
Subject: [PATCH v14 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-v14: 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 76aaf8982554..01b8c917cb33 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>
 
 / {
 	compatible = "qi,lb60", "ingenic,jz4740";
@@ -31,3 +32,9 @@
 		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>;
+};
-- 
2.21.0.593.g511ec345e18