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From:   Paul Cercueil <paul@crapouillou.net>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ralf Baechle <ralf@linux-mips.org>,
        Paul Burton <paul.burton@mips.com>,
        Jonathan Corbet <corbet@lwn.net>
Cc:     od@zcrc.me, Mathieu Malaterre <malat@debian.org>,
        linux-pwm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org,
        linux-mips@linux-mips.org, linux-doc@vger.kernel.org,
        linux-clk@vger.kernel.org, Paul Cercueil <paul@crapouillou.net>
Subject: [PATCH v7 22/24] MIPS: CI20: Reduce system timer and clocksource to 3 MHz
Date:   Tue, 21 Aug 2018 19:18:46 +0200
Message-Id: <20180821171846.23050-1-paul@crapouillou.net>
In-Reply-To: <20180821171635.22740-1-paul@crapouillou.net>
References: <20180821171635.22740-1-paul@crapouillou.net>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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

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

Notes:
     v5: New patch
    
     v6: Set also the rate for the clocksource channel's clock
    
     v7: No change

 arch/mips/boot/dts/ingenic/ci20.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 50cff3cbcc6d..f64d32443097 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 and clocksource */
+	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
+	assigned-clock-rates = <3000000>, <3000000>;
+};
-- 
2.11.0