From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [RFC PATCH 00/14] Support timezone of ACPI TAD and EFI TIME Date: Fri, 20 Dec 2013 13:43:38 -0800 Message-ID: <52B4BA0A.1030902@zytor.com> References: <1387439053-8711-1-git-send-email-jlee@suse.com> <1387517916.3539.4446.camel@linux-s257.site> <52B4B242.5010002@zytor.com> <2787644.ytU7M33B4r@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from terminus.zytor.com ([198.137.202.10]:48306 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753130Ab3LTVoW (ORCPT ); Fri, 20 Dec 2013 16:44:22 -0500 In-Reply-To: <2787644.ytU7M33B4r@vostro.rjw.lan> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Rafael J. Wysocki" Cc: joeyli , Alessandro Zummo , Matt Fleming , Matthew Garrett , Elliott@hp.com, samer.el-haj-mahmoud@hp.com, Oliver Neukum , werner@suse.com, trenn@suse.de, JBeulich@suse.com, linux-kernel@vger.kernel.org, rtc-linux@googlegroups.com, x86@kernel.org, "linux-efi@vger.kernel.org" , linux-acpi@vger.kernel.org, Borislav Petkov On 12/20/2013 01:45 PM, Rafael J. Wysocki wrote: > > My understanding, however, is that to use the TAD, we don't actually need to > create a struct acpi_device for it. We just need a handle to the ACPICA > object which can be found using acpi_get_devices() as soon as the namespace > has been extracted from the DSDT and friends. That in turn happens in > acpi_early_init(), which is called from start_kernel() right before > efi_late_init(). > > Is that early enough? > Possibly... will have to investigate. I would also ask if the same applies to the PNP0B0x devices -- all we really need there is the presence/absence indication and the I/O port base. -hpa