linux-kernel - Re: [PATCH] ARM: dts: rk3288: add arm,cpu-registers-not-fw-configured

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Message-ID: <20141205182725.GA11755@quad.lixom.net>
Date:	Fri, 5 Dec 2014 10:27:25 -0800
From:	Olof Johansson <olof@...om.net>
To:	Sonny Rao <sonnyrao@...omium.org>
Cc:	Heiko Stuebner <heiko@...ech.de>, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	dianders@...omium.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Kever Yang <kever.yang@...k-chips.com>,
	eddie.cai@...k-chips.com
Subject: Re: [PATCH] ARM: dts: rk3288: add arm,cpu-registers-not-fw-configured

On Tue, Nov 25, 2014 at 10:54:00AM -0800, Sonny Rao wrote:
> This will enable use of physical arch timers on rk3288, where each
> core comes out of reset with a different virtual offset.  Using
> physical timers will help with SMP booting on coreboot and older
> u-boot and should also allow suspend-resume and cpu-hotplug to work on
> all firmwares.
> 
> Firmware which does initialize the cpu registers properly at boot and
> cpu-hotplug can remove this property from the device tree.
> 
> Signed-off-by: Sonny Rao <sonnyrao@...omium.org>
> ---
>  arch/arm/boot/dts/rk3288.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
> index 0f50d5d..c861f52 100644
> --- a/arch/arm/boot/dts/rk3288.dtsi
> +++ b/arch/arm/boot/dts/rk3288.dtsi
> @@ -139,6 +139,7 @@
>  
>  	timer {
>  		compatible = "arm,armv7-timer";
> +		arm,cpu-registers-not-fw-configured;
>  		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
>  			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
>  			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,

Applied, thanks.


-Olof
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