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SubjectRe: [PATCH] [RTC] Add Freescale MC13783 RTC driver
Hi Uwe,

Uwe Kleine-König wrote:
> Hello,
> On Sat, Oct 24, 2009 at 10:35:42AM +0200, Uwe Kleine-König wrote:
>> This driver provides support for the RTC part integrated into the
>> Freescale MC13783 PMIC and bases on patch created earlier by Sascha
>> Hauer.
>> Signed-off-by: Sascha Hauer <>
>> Signed-off-by: Uwe Kleine-König <u.kleine-kö>
>> Cc: Valentin Longchamp <>
>> Cc: Paul Gortmaker <>
>> Cc: Alessandro Zummo <>
>> Cc:
>> ---
>> Hello,
>> this patch depends on
>> mfd/mc13783: near complete rewrite
>> sent earlier on lkml[1]. Compared to the earlier version of rtc support
>> on mc13783 as sent by Sascha, this driver got reset detection and
>> therefore depends on the patch above.
>> A tree runnable on Phytec's PCM038 is available in my git tree
>> git:// mc13783
>> . (Maybe I will rewrite these commits, so please expect it might change
>> in a non-fast-forward manner.)
> Valentin, could you already test this? Any comments by the others?

I have tested your patches (taken your mc13783 branch today, and merged
it into my patches rebased on 2.6.32-rc6).

Your mfd/mc13783 rewrite seems to work for me (but since there is no
real usage for now, I don't use ADC yet and regulator don't do a lot).
But it runs fine on my hardware.

However, I get the hctosys: unable to read the hardware clock error
message at boot (from drivers/rtc/hctosys.c:62). Is it normal ?

Furthermore, the date and time are saved during system off, but the time
is not updated: if I shut down the system during 10 minutes, my time
will get a 10 minute delay. Is this a normal behavior with you current
implementation or is there something we have wrong in our design/code
(we have battery for the mc13783) ? I will have a further look at this
later, didn't have time now.


Valentin Longchamp, PhD Student, EPFL-STI-LSRO1, Phone: +41216937827
MEA3485, Station 9, CH-1015 Lausanne
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