Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751621AbbGKSWg (ORCPT ); Sat, 11 Jul 2015 14:22:36 -0400 Received: from mga02.intel.com ([134.134.136.20]:54236 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751154AbbGKSWf (ORCPT ); Sat, 11 Jul 2015 14:22:35 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,454,1432623600"; d="scan'208";a="745207909" Message-ID: <55A15EE9.3010102@linux.intel.com> Date: Sat, 11 Jul 2015 11:22:33 -0700 From: Arjan van de Ven User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Larry Finger , LKML , Li Aubrey , Ingo Molnar CC: Porteus Kiosk , Bastien Nocera , Avi Weiss , Benny Silberstein Subject: Re: V4.0.x fails to create /dev/rtc0 on Winbook TW100 when CONFIG_PINCTRL_BAYTRAIL is set, bisected to commit 7486341 References: <55A1598A.5040903@lwfinger.net> <55A15E93.8070706@linux.intel.com> In-Reply-To: <55A15E93.8070706@linux.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1067 Lines: 19 On 7/11/2015 11:21 AM, Arjan van de Ven wrote: > On 7/11/2015 10:59 AM, Larry Finger wrote: >> On a Winbook TW100 BayTrail tablet, kernel 4.0 and later do not create /dev/rtc0 when CONFIG_PINCTRL_BAYTRAIL is set in the configuration. Removing this option from the >> config creates a real-time clock; however, it is no longer possible to get the tablet to sleep using the power button. Only complete shutdown works. >> >> This problem was bisected to the following commit: > > in "hardware reduced mode" (e.g. tablets) on Baytrail the RTC is not actually enabled/initialized by the firmware; talking to it may appear to work but it's really not > a good idea (and breaks things likes suspend/resume etc). (or in other words, many of the legacy PC things are not supposed to be there) what did you want to use rtc0 for? -- 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/