Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754983Ab3C1PEJ (ORCPT ); Thu, 28 Mar 2013 11:04:09 -0400 Received: from mail-oa0-f54.google.com ([209.85.219.54]:61317 "EHLO mail-oa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751160Ab3C1PEH (ORCPT ); Thu, 28 Mar 2013 11:04:07 -0400 Message-ID: <51545BE4.9050206@gmail.com> Date: Thu, 28 Mar 2013 10:04:04 -0500 From: Rob Herring User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 MIME-Version: 1.0 To: Nicolas Pitre CC: Stefano Stabellini , "xen-devel@lists.xensource.com" , "linux@arm.linux.org.uk" , "arnd@arndb.de" , Marc Zyngier , Will Deacon , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v3] [RFC] arm: use PSCI if available References: <1364388639-11210-1-git-send-email-stefano.stabellini@eu.citrix.com> <20130327133811.GE18429@mudshark.cambridge.arm.com> <20130327172306.GB20990@mudshark.cambridge.arm.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1543 Lines: 44 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@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/