From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTP id CC85C996 for ; Mon, 5 May 2014 02:50:39 +0000 (UTC) Received: from li42-95.members.linode.com (li42-95.members.linode.com [209.123.162.95]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id B1C292022C for ; Mon, 5 May 2014 02:50:38 +0000 (UTC) Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: text/plain; charset=us-ascii From: Pantelis Antoniou In-Reply-To: <7701777.LWanFdz802@vostro.rjw.lan> Date: Sun, 4 May 2014 19:44:27 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <93AA3E28-F354-42D8-B8F2-F2517493CE23@antoniou-consulting.com> References: <20140504171807.GA4418@quad.lixom.net> <5366789F.4090800@roeck-us.net> <7701777.LWanFdz802@vostro.rjw.lan> To: Rafael J. Wysocki Cc: "dvhart@dvhart.com" , ksummit-discuss@lists.linuxfoundation.org, Georgi Vlaev , "Rafael J. Wysocki" , Greg Kroah-Hartman Subject: Re: [Ksummit-discuss] [TECH TOPIC] Driver model/resources, ACPI, DT, etc (sigh) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi Rafael, On May 4, 2014, at 3:02 PM, Rafael J. Wysocki wrote: > Hi, >=20 > On Sunday, May 04, 2014 10:27:59 AM Guenter Roeck wrote: >> On 05/04/2014 10:18 AM, Olof Johansson wrote: >=20 > [cut] >=20 >>> I think it's very optimistic to assume that there will ever be a = common >>> solution for both ends of the spectrum (embedded - enterprise), but = we >>> should make sure we can stay sane and not have more solutions than = we need >>> in parallel, and that things will work together where there is = overlap. >>>=20 >> We (Juniper) are moving towards a partial conversion from ACPI to DT, = pretty >> much just enough to let us work with DT overlays on X86. If there is = interest >> to discuss this, it might make sense to invite Pantelis Antoniou and = possibly >> Georgi Vlaev, since both are instrumental to making it work. >=20 > I actually wonder how you are going to handle things like references = from > a DT overlay to ACPI device objects in the namespace (like various = things > controllers etc). >=20 At the moment we got dynamic PCI DT node creation; i.e. the PCI bus(es) = is probed and the platform's pci bios creates DT nodes; PCI nodes that already = defined do not get created from scratch, rather DT properties are appended to them. It is not a whole-sale conversion (yet), but it seems to work find as a = target for DT overlays. All this is on vanilla x86-64 btw, with very small fixes to get booted = using an DT blob. So far we didn't have to deal with ACPI device objects; perhaps it will = be required for when we tackle pure platform devices. But TBH it doesn't seem that = difficult. > Thanks! >=20 > --=20 > I speak only for myself. > Rafael J. Wysocki, Intel Open Source Technology Center. Regards -- Pantelis