linux-kernel - [PATCH v12 11/13] MIPS: CI20: Reduce system timer and clocksource to 3 MHz

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Message-Id: <20190521145141.9813-12-paul@crapouillou.net>
Date:   Tue, 21 May 2019 16:51:39 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        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>,
        Lee Jones <lee.jones@...aro.org>
Cc:     Mathieu Malaterre <malat@...ian.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-clk@...r.kernel.org, od@...c.me,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v12 11/13] MIPS: CI20: Reduce system timer and clocksource to 3 MHz

The default clock (48 MHz) is too fast for the system timer.

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

Notes:
    v5: New patch
    
    v6: Set also the rate for the clocksource channel's clock
    
    v7: No change
    
    v8: No change
    
    v9: Don't configure clock timer1, as the OS Timer is used as
    	clocksource on this SoC
    
    v10: Revert back to v8 bahaviour. Let the user choose what
    	 clocksource should be used.
    
    v11-v12: No change

 arch/mips/boot/dts/ingenic/ci20.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 4f7b1fa31cf5..2e9952311ecd 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -2,6 +2,7 @@
 /dts-v1/;
 
 #include "jz4780.dtsi"
+#include <dt-bindings/clock/ingenic,tcu.h>
 #include <dt-bindings/gpio/gpio.h>
 
 / {
@@ -238,3 +239,9 @@
 		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>;
+};
-- 
2.21.0.593.g511ec345e18