linux-kernel - Re: [PATCH] [RTC] Add Freescale MC13783 RTC driver

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Date:	Wed, 04 Nov 2009 19:12:51 +0100
From:	Valentin Longchamp <valentin.longchamp@...l.ch>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Paul Gortmaker <p_gortmaker@...oo.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	"rtc-linux@...glegroups.com" <rtc-linux@...glegroups.com>
Subject: Re: [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 <s.hauer@...gutronix.de>
>> Signed-off-by: Uwe Kleine-König <u.kleine-könig@...gutronix.de>
>> Cc: Valentin Longchamp <valentin.longchamp@...l.ch>
>> Cc: Paul Gortmaker <p_gortmaker@...oo.com>
>> Cc: Alessandro Zummo <a.zummo@...ertech.it>
>> Cc: rtc-linux@...glegroups.com
>> ---
>> 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://git.pengutronix.de/git/ukl/linux-2.6.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.

Val

-- 
Valentin Longchamp, PhD Student, EPFL-STI-LSRO1
valentin.longchamp@...l.ch, Phone: +41216937827
http://people.epfl.ch/valentin.longchamp
MEA3485, Station 9, CH-1015 Lausanne
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