linux-kernel - Re: [PATCH 2/2] rtc: sprd: Add Spreadtrum RTC driver

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Message-ID: <CAMz4kuJNALMSmGV7tSiGZMj6S2=5LyfaqTpzowzM95gLKpHO1A@mail.gmail.com>
Date:   Wed, 8 Nov 2017 13:48:54 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     Baolin Wang <baolin.wang@...eadtrum.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-rtc@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 2/2] rtc: sprd: Add Spreadtrum RTC driver

On 8 November 2017 at 13:35, Alexandre Belloni
<alexandre.belloni@...e-electrons.com> wrote:
> 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.

That's great. Thanks for explanation.

-- 
Baolin.wang
Best Regards