linux-kernel - Re: [PATCH 3/4] rtc: rtc-hid-sensor-time: add option hctosys to set time at boot

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Date:	Tue, 21 May 2013 14:42:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexander Holler <holler@...oftware.de>
Cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@....ac.uk>,
	Jiri Kosina <jkosina@...e.cz>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH 3/4] rtc: rtc-hid-sensor-time: add option hctosys to set
 time at boot

On Sun,  5 May 2013 13:21:26 +0200 Alexander Holler <holler@...oftware.de> wrote:

> drivers/rtc/hctosys (CONFIG_RTC_HCTOSYS) doesn't work for
> rtc-hid-sensor-time because it will be called in late_init, and thus before
> rtc-hid-sensor-time gets loaded. To set the time through
> rtc-hid-sensor-time at startup, the module now checks by default if the
> system time is before 1970-01-02 and sets the system time (once) if this is
> the case.
> 
> To disable this behaviour, set the module option hctosys to zero, e.g. by
> using rtc-hid-sensor-time.hctosys=0 at the kernel command line if the
> driver is statically linked into the kernel.

I still find this rather unpleasant.  Partly because it's hacky, mainly
because it only solves the problem for one driver.

Can we please try harder to find a more general fix?

For example: if hctosys finds there are no drivers available, it sets a
flag.  Later when drivers are registered(?), that flag is queried and,
if set, we set the system time at this time.

Or something.
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