linux-kernel - Re: [PATCH RESEND 0/4] SMP support for Broadcom NSP

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Message-ID: <20151105093443.GO8644@n2100.arm.linux.org.uk>
Date:	Thu, 5 Nov 2015 09:34:43 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kapil Hali <kapilh@...adcom.com>
Cc:	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>, Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Gregory Fong <gregory.0xf0@...il.com>,
	Lee Jones <lee@...nel.org>, Hauke Mehrtens <hauke@...ke-m.de>,
	Heiko Stuebner <heiko@...ech.de>,
	Kever Yang <kever.yang@...k-chips.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Olof Johansson <olof@...om.net>,
	Paul Walmsley <paul@...an.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH RESEND 0/4] SMP support for Broadcom NSP

On Thu, Nov 05, 2015 at 12:51:17AM -0500, Kapil Hali wrote:
> Hi,
> 
> This series adds SMP support for Broadcom's Northstar Plus SoC.
> 
> There are similar SMP enablement methods for many ARMv7 bsed SoCs.
> BCM NSP SoC, has a typical such mechanism - after power-on, the
> secondary core is held in a standby state, primary core provides a
> startup address for the secondary core and wakes it up. Booting of
> the secondary core is serialized using pen_release global variable.

Why do you need the pen_release stuff?  The above implies that you
have only one secondary core, and you can control when it comes out
of standby state.

Please, don't assume that the pen_release stuff is any kind of recommended
or standardised system.  It isn't.  It's a hack for ARMs evaluation
platforms.

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