linux-kernel - Re: [PATCH v3 4/5] ARM: dts: mt8135: enable basic SMP bringup for mt8135

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Message-ID: <55A51A54.7000208@mentor.com>
Date:	Tue, 14 Jul 2015 09:19:00 -0500
From:	Nathan Lynch <Nathan_Lynch@...tor.com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	<devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	<srv_heupstream@...iatek.com>, Arnd Bergmann <arnd@...db.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	<linux-kernel@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Olof Johansson <olof@...om.net>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 4/5] ARM: dts: mt8135: enable basic SMP bringup for
 mt8135

On 07/14/2015 12:18 AM, Yingjoe Chen wrote:
> Add arch timer node to enable arch-timer support. MT8135 firmware
> doesn't correctly setup arch-timer frequency and CNTVOFF, add
> properties to workaround this.

[...]

>  
> +	timer {
> +		compatible = "arm,armv7-timer";
> +		interrupt-parent = <&gic>;
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) |
> +					  IRQ_TYPE_LEVEL_LOW)>;
> +		clock-frequency = <13000000>;
> +		arm,cpu-registers-not-fw-configured;

It's disappointing to see this property in new DTS submissions.  It
prevents taking advantage of the VDSO for gettimeofday/clock_gettime.

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