linux-kernel - Re: [PATCH v3 5/8] ARM: mediatek: add smp bringup code for MT6580

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Message-ID: <20150805094429.GU7557@n2100.arm.linux.org.uk>
Date:	Wed, 5 Aug 2015 10:44:30 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Scott Shu <scott.shu@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, wsd_upstream@...iatek.com,
	scott.shu@...il.com, loda.chou@...iatek.com,
	linux-kernel@...r.kernel.org, jades.shih@...iatek.com,
	linux-mediatek@...ts.infradead.org, Mars.Cheng@...iatek.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 5/8] ARM: mediatek: add smp bringup code for MT6580

On Tue, Aug 04, 2015 at 09:54:21PM +0800, Scott Shu wrote:
> Add support for cpu enable-method "mediatek,mt6580-smp" for booting
> secondary CPUs on MT6580.

If you have CPU power domain support, and you power up and power down the
CPUs, why do you need the boot_lock and pen_release stuff?  Isn't keeping
the power off on a CPU sufficient to prevent it entering the kernel?

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