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

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Date:	Wed, 6 Jan 2016 09:09:25 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	"H. Nikolaus Schaller" <hns@...delico.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

* H. Nikolaus Schaller <hns@...delico.com> [160106 08:48]:
> 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).

OK

> > 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.

OK. It could be also some .config change with something built-in?

Regards,

Tony
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