From: Alexandre Belloni <alexandre.belloni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
To: Baolin Wang <baolin.wang-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Baolin Wang <baolin.wang-lxIno14LUO0EEoCn2XhGlw@public.gmane.org>,
Alessandro Zummo
<a.zummo-BfzFCNDTiLLj+vYz1yj4TQ@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-rtc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH 2/2] rtc: sprd: Add Spreadtrum RTC driver
Date: Wed, 8 Nov 2017 06:35:22 +0100 [thread overview]
Message-ID: <20171108053522.qhoagssswonevae4@piout.net> (raw)
In-Reply-To: <CAMz4kuK=7W7t63Axi=jcqLPYz-L=MF=uE-8rNNf9LhqP1E=hXw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On 08/11/2017 at 13:29:21 +0800, Baolin Wang wrote:
> > Don't do that. This is a valuable information. If you know the time is
> > invalid, return -EINVAL in read_time(). What your are doing here is
> > confusing the system by making it believe your fake date is the correct
> > time.
>
> Usually for mobile device, we should give one reasonable start time if
> the RTC powered down. Anyway I can remove this feature now.
> Very appreciated for your helpful comments.
Then userspace will have -EINVAL when reading the RTC and will be able
to set the RTC to whatever value it wants. Don't encode that policy in
the kernel.
--
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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next prev parent reply other threads:[~2017-11-08 5:35 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-07 11:34 [PATCH 1/2] dt-bindings: rtc: Add Spreadtrum SC27xx RTC documentation Baolin Wang
2017-11-07 11:34 ` [PATCH 2/2] rtc: sprd: Add Spreadtrum RTC driver Baolin Wang
2017-11-08 3:44 ` Alexandre Belloni
2017-11-08 5:29 ` Baolin Wang
[not found] ` <CAMz4kuK=7W7t63Axi=jcqLPYz-L=MF=uE-8rNNf9LhqP1E=hXw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-08 5:35 ` Alexandre Belloni [this message]
[not found] ` <20171108053522.qhoagssswonevae4-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org>
2017-11-08 5:48 ` Baolin Wang
[not found] ` <7037c5053a533505f38fc036290a398989cfdafc.1510051749.git.baolin.wang-lxIno14LUO0EEoCn2XhGlw@public.gmane.org>
2017-11-08 3:15 ` [PATCH 1/2] dt-bindings: rtc: Add Spreadtrum SC27xx RTC documentation Alexandre Belloni
[not found] ` <20171108031520.zx2ipqugiyypmpms-m++hUPXGwpdeoWH0uzbU5w@public.gmane.org>
2017-11-08 5:02 ` Baolin Wang
2017-11-08 5:12 ` Alexandre Belloni
2017-11-08 5:33 ` Baolin Wang
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