linux-kernel - Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery

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Message-Id: <2AC46952-3758-458A-B0A5-1794C207BD4C@goldelico.com>
Date:	Wed, 6 Jan 2016 17:47:33 +0100
From:	"H. Nikolaus Schaller" <hns@...delico.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Laxman Dewangan <ldewangan@...dia.com>, Nishanth Menon <nm@...com>,
	Benoît Cousson <bcousson@...libre.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	linux-omap <linux-omap@...r.kernel.org>,
	devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Marek Belisko <marek@...delico.com>
Subject: Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery

Hi Tony,

Am 06.01.2016 um 17:41 schrieb Tony Lindgren <tony@...mide.com>:

> Hi,
> 
> * H. Nikolaus Schaller <hns@...delico.com> [160106 00:12]:
>> Am 06.01.2016 um 02:00 schrieb Tony Lindgren <tony@...mide.com>:
>>> 
>>> Also I'm not seeing just zeroes coming from RTC after typing hwclock
>>> on omap5-uevm. It's working on x15 though.
>>> 
>>> Nikolaus, is hwclock command working for you on omap5-uevm?
>> 
>> Well, yes and no. It appears it *was* working when tested last time
>> (we sometimes have months of delay for submitting patches upstream).
>> 
>> I have found an SD image with 4.3-rc6 with this patch in the dtb and
>> there it works. With 4.4-rc8 it does not work. hwclock command hangs for
>> 10 seconds (I guess some timeout).
>> 
>> I have checked the dtb and in both cases it is interrupts = <8 0>;
>> 
>> xxd /sys/firmware/devicetree/base/ocp/i2c@...70000/palmas@...rtc/interrupts
>> 0000000: 0000 0008 0000 0000
>> 
>> So I think something has changed in the rtc driver or somewhere else.
> 
> I just gave it a try on v4.3-rc6 with omap5-uevm.dts patched for
> RTC, and I still don't have hwclock working with RTC.
> 
> It seems you have some additional patches there that make it work?

Hm. Not that I am aware of. We just did add the rtc nodes but did not
touch palmas drivers (except adding the gpadc of this patch series).

> 
> I guess it could also be a bootloader change if it's a different
> SD image that works for you.

Yes, it is using a 2 years old U-Boot instead 2015.10 compiled from
source. I will try to find out if it makes a difference.

BR,
Nikolaus

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