linux-kernel - Re: V4.0.x fails to create /dev/rtc0 on Winbook TW100 when CONFIG_PINCTRL_BAYTRAIL is set, bisected to commit 7486341

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Message-ID: <55A15E93.8070706@linux.intel.com>
Date:	Sat, 11 Jul 2015 11:21:07 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Larry Finger <Larry.Finger@...inger.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Li Aubrey <aubrey.li@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>
CC:	Porteus Kiosk <porteus.kiosk@...il.com>,
	Bastien Nocera <hadess@...ess.net>,
	Avi Weiss <aviw@...chmarkmerchantsolutions.com>,
	Benny Silberstein <bennys@...chmarkmerchantsolutions.com>
Subject: Re: V4.0.x fails to create /dev/rtc0 on Winbook TW100 when CONFIG_PINCTRL_BAYTRAIL
 is set, bisected to commit 7486341

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).



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