linux-kernel - Re: [PATCH 6/7] ARM: dts: mt8135: enable basic SMP bringup for mt8135

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Date:	Mon, 4 May 2015 16:31:05 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	devicetree@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel@...r.kernel.org, Marc Carino <marc.ceeeee@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	srv_heupstream@...iatek.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 6/7] ARM: dts: mt8135: enable basic SMP bringup for mt8135

On Fri, May 01, 2015 at 03:43:29PM +0800, 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.
> 
> This also set cpu enable-method to enable SMP.
> 
> Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> ---
>  arch/arm/boot/dts/mt8135.dtsi | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/mt8135.dtsi b/arch/arm/boot/dts/mt8135.dtsi
> index 612bd22..eb5e06f 100644
> --- a/arch/arm/boot/dts/mt8135.dtsi
> +++ b/arch/arm/boot/dts/mt8135.dtsi
> @@ -46,6 +46,7 @@
>  	cpus {
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> +		enable-method = "mediatek,mt81xx-tz-smp";
>  
>  		cpu0: cpu@0 {
>  			device_type = "cpu";
> @@ -103,6 +104,21 @@
>  		};
>  	};
>  
> +	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;
> +	};

This is the SoC dtsi file. What you say here is that all MT8135
present and future firmwares on all boards do this wrong.
Shouldn't you fix the firmware instead? Shouldn't this property be board
specific?

Sascha

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