From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: john stultz <johnstul@us.ibm.com>
Cc: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>,
rtc-linux@googlegroups.com, LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Alessandro Zummo <a.zummo@towertech.it>
Subject: Re: [rtc-linux] [PATCH 04/10] RTC: Cleanup rtc_class_ops->read_alarm()
Date: Tue, 22 Feb 2011 19:51:43 +0000 [thread overview]
Message-ID: <20110222195143.GC31611@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <1298403310.9215.26.camel@work-vm>
On Tue, Feb 22, 2011 at 11:35:10AM -0800, john stultz wrote:
> Yea. The way I thought about it originally was that you can set an alarm
> and that alarm will fire if the machine is on, suspended or even in some
> cases off. Then, when the machine is booted (system reset), the state
> of the RTC's alarm should not be trusted.
> Your description of the AIE/UIE having random values aligns with that
> intuition.
This seems rather worrying - it sounds like it might mean that the
device might come up firing spuriously which doesn't seem terribly
clever.
> However, if the expectation is that once set, the alarm should persist
> across any number of reboots, this makes it a bit more complicated.
For an embedded device I'd expect that either nothing about the RTC
would persist (including the time) or everything would.
next prev parent reply other threads:[~2011-02-22 19:51 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-21 23:55 [PATCH 00/10] [RFC] RTC: Cleanups for 2.6.39 John Stultz
2011-02-21 23:55 ` [PATCH 01/10] RTC: Cleanup rtc_class_ops->irq_set_state John Stultz
2011-02-21 23:55 ` [PATCH 02/10] RTC: Cleanup rtc_class_ops->irq_set_freq() John Stultz
2011-02-21 23:55 ` [PATCH 03/10] RTC: Cleanup rtc_class_ops->update_irq_enable() John Stultz
2011-02-21 23:55 ` [PATCH 04/10] RTC: Cleanup rtc_class_ops->read_alarm() John Stultz
2011-02-22 2:34 ` [rtc-linux] " Mark Brown
2011-02-22 2:55 ` John Stultz
2011-02-22 8:09 ` john stultz
2011-02-22 12:51 ` Marcelo Roberto Jimenez
2011-02-22 19:35 ` john stultz
2011-02-22 19:51 ` Mark Brown [this message]
2011-02-22 19:58 ` john stultz
2011-02-22 21:26 ` Marcelo Roberto Jimenez
2011-02-22 18:16 ` Mark Brown
2011-02-22 19:51 ` john stultz
2011-02-22 20:00 ` Mark Brown
2011-02-22 20:22 ` john stultz
2011-02-22 21:05 ` Mark Brown
2011-02-22 21:21 ` john stultz
2011-02-22 21:27 ` Thomas Gleixner
2011-02-22 21:40 ` Mark Brown
2011-02-22 21:33 ` Mark Brown
2011-02-22 22:10 ` john stultz
2011-02-22 23:07 ` Mark Brown
2011-02-22 19:53 ` john stultz
2011-02-22 20:31 ` Mark Brown
2011-02-21 23:55 ` [PATCH 05/10] RTC: Clean out UIE icotl implementations John Stultz
2011-02-21 23:55 ` [PATCH 06/10] RTC: Include information about UIE and PIE in RTC driver proc John Stultz
2011-02-21 23:55 ` [PATCH 07/10] RTC: Remove UIE and PIE information from the sa1100 " John Stultz
2011-02-21 23:55 ` [PATCH 08/10] RTC: Fix the cross interrupt issue on rtc-test John Stultz
2011-02-21 23:55 ` [PATCH 09/10] RTC: sa1100: Update the sa1100 RTC driver John Stultz
2011-02-21 23:55 ` [PATCH 10/10] RTC: Fix up rtc.txt documentation to reflect changes to generic rtc layer John Stultz
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