linux-kernel - Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

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Message-ID: <20150313120659.GE30671@e104818-lin.cambridge.arm.com>
Date:	Fri, 13 Mar 2015 12:07:00 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"heiko@...ech.de" <heiko@...ech.de>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arm@...nel.org" <arm@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and
 evaluation board dts

On Fri, Mar 13, 2015 at 10:34:54AM +0000, Mark Rutland wrote:
> > > Which of spin-table/psci are you planning on using for SMP support, and
> > > when would that be likely to appear?
> > 
> > We have a qcom specific SMP enablement method for this device.  This
> > was one of our first devices so it utilized as much from arm 32-bit as
> > possible.
> 
> Implementation specific enable methods are something we really don't
> want to see for arm64.

I fully agree (and we've been stating this for over two years).

> If PSCI is out of the question then a spin-table shim in your
> bootloader shouldn't be too hard to implement.

And I guess only WFI cpuidle supported in Linux.

-- 
Catalin
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