linux-kernel - Re: [PATCH 2/6] arm64: Add DTS support for Spreadtrum's Shark64 SoC

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Message-ID: <20141001111717.GH12702@e104818-lin.cambridge.arm.com>
Date:	Wed, 1 Oct 2014 12:17:17 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"zhang.lyra@...il.com" <zhang.lyra@...il.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"jslaby@...e.cz" <jslaby@...e.cz>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"broonie@...aro.org" <broonie@...aro.org>,
	Mark Rutland <Mark.Rutland@....com>,
	"m-karicheri2@...com" <m-karicheri2@...com>,
	Pawel Moll <Pawel.Moll@....com>,
	"artagnon@...il.com" <artagnon@...il.com>,
	"rrichter@...ium.com" <rrichter@...ium.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Will Deacon <Will.Deacon@....com>,
	"orsonzhai@...il.com" <orsonzhai@...il.com>,
	"geng.ren@...eadtrum.com" <geng.ren@...eadtrum.com>,
	"zhizhou.zhang@...eadtrum.com" <zhizhou.zhang@...eadtrum.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"chunyan.zhang" <chunyan.zhang@...eadtrum.com>
Subject: Re: [PATCH 2/6] arm64: Add DTS support for Spreadtrum's Shark64 SoC

On Mon, Sep 29, 2014 at 02:47:47PM +0100, Arnd Bergmann wrote:
> On Monday 29 September 2014 20:04:49 zhang.lyra@...il.com wrote:
> > +	cpus {
> > +		#address-cells = <2>;
> > +		#size-cells = <0>;
> > +
> > +		cpu@0 {
> > +			device_type = "cpu";
> > +			compatible = "arm,armv8";
> > +			reg = <0x0 0x0>;
> > +			enable-method = "spin-table";
> > +			cpu-release-addr = <0x0 0x8000fff8>;
> > +		};
> 
> New platforms should avoid using "spin-table" method. Please
> change the boot loader to implement PSCI if you can.

As usual, I strongly recommend PSCI here if the CPU supports EL3. It
would solve the cpuidle kernel support as well with the generic cpuidle
driver and the PSCI back-end.

-- 
Catalin
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