linux-kernel - Re: [PATCH v3] [RFC] arm: use PSCI if available

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Message-ID: <51545BE4.9050206@gmail.com>
Date:	Thu, 28 Mar 2013 10:04:04 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"arnd@...db.de" <arnd@...db.de>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] [RFC] arm: use PSCI if available

On 03/28/2013 09:51 AM, Nicolas Pitre wrote:
> On Thu, 28 Mar 2013, Stefano Stabellini wrote:
> 
>> - the interface to bring up secondary cpus is different and based on
>> PSCI, in fact Xen is going to add a PSCI node to the device tree so that
>> Dom0 can use it.
>>
>> Oh wait, Dom0 is not going to use the PSCI interface even if the node is
>> present on device tree because it's going to prefer the platform smp_ops
>> instead.
> 
> Waitaminute...  I must have missed this part.
> 
> Who said platform specific methods must be used in preference to PSCI?

I did. Specifically, I said the platform should be allowed to provide
its own smp_ops. A platform may need to do addtional things on top of
PSCI for example.

> If DT does provide PSCI description, then PSCI should be used.  Doing 
> otherwise is senseless.  If PSCI is not to be used, then it should not 
> be present in DT.

You can't assume the DT and kernel are in-sync. For example, I've added
PSCI in the firmware and DTB (part of the firmware), but the highbank
kernel may or may not use it depending if I convert it.

Rob

> 
> 
> Nicolas
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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