From: Nishanth Menon <nm-l0cyMroinI0@public.gmane.org>
To: "H. Nikolaus Schaller"
<hns-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>,
Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
Cc: "Grygorii Strashko"
<grygorii.strashko-l0cyMroinI0@public.gmane.org>,
"Laxman Dewangan"
<ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
"Benoît Cousson"
<bcousson-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
"Rob Herring" <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"Pawel Moll" <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
"Mark Rutland" <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
"Ian Campbell"
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
"Kumar Gala" <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
"Russell King" <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
linux-omap <linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"Marek Belisko" <marek-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>,
"Gražvydas Ignotas"
<notasas-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Keerthy <j-keerthy-l0cyMroinI0@public.gmane.org>
Subject: Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery
Date: Wed, 13 Jan 2016 12:31:28 -0600 [thread overview]
Message-ID: <56969800.5010206@ti.com> (raw)
In-Reply-To: <2B99611A-5D2E-4D17-A17D-0150516109FD-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
On 01/13/2016 12:08 PM, H. Nikolaus Schaller wrote:
[...]
>> OK. So are we sure the TWL driver will never have to toggle this pin?
>
> After studying the Palmas TRM it appears that this pin just should be "high"
> to be able to write to RTC and some scratchpad register. If the Palmas OTP
> is programmed to use gpio7 as msecure input.
Thanks for digging it up. we dont use the scratchpad, but in some cases
where SoC cold reset is involved, those registers may store additional
information.
>
> Since the scratchpad is not used we can permanently enable msecure. Which
> means that we must somehow get the driving output to be "1".
>
> This can be either done by
> * a gpio with pull-up - switched to input mode as I proposed, or
I think you intended to suggest to do a mux to gpio with just pinmux
pull? The internal pull on padconf is very weak - for typical needs like
these, it is rather suggested to stick with real GPIO drive to prevent
conditions like noise interference(for example).
--
Regards,
Nishanth Menon
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next prev parent reply other threads:[~2016-01-13 18:31 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-05 12:01 [PATCH 0/3] Enable twl603x-GPADC for some OMAP4/OMAP5 boards and Palmas-RTC for OMAP5 H. Nikolaus Schaller
[not found] ` <cover.1451995297.git.hns-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
2016-01-05 12:01 ` [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery H. Nikolaus Schaller
2016-01-05 23:40 ` Nishanth Menon
[not found] ` <568C5451.8070709-l0cyMroinI0@public.gmane.org>
2016-01-06 1:00 ` Tony Lindgren
2016-01-06 8:11 ` H. Nikolaus Schaller
[not found] ` <8FE6954B-6411-4593-9CE5-717A469A6AA8-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
2016-01-06 16:41 ` Tony Lindgren
2016-01-06 16:47 ` H. Nikolaus Schaller
[not found] ` <2AC46952-3758-458A-B0A5-1794C207BD4C-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
2016-01-06 17:09 ` Tony Lindgren
2016-01-08 17:49 ` H. Nikolaus Schaller
2016-01-08 18:15 ` Tony Lindgren
[not found] ` <20160108181551.GX12777-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2016-01-08 18:32 ` H. Nikolaus Schaller
2016-01-08 19:04 ` Tony Lindgren
2016-01-08 19:31 ` H. Nikolaus Schaller
2016-01-11 20:24 ` Tony Lindgren
[not found] ` <20160111202421.GA12777-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2016-01-12 0:09 ` Tony Lindgren
[not found] ` <20160112000917.GC12777-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2016-01-12 13:30 ` H. Nikolaus Schaller
2016-01-12 21:27 ` H. Nikolaus Schaller
[not found] ` <E4C8F6CA-37C1-406F-9804-46055253BED9-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
2016-01-12 21:37 ` Nishanth Menon
[not found] ` <5695722B.90202-l0cyMroinI0@public.gmane.org>
2016-01-12 22:13 ` Tony Lindgren
2016-01-13 10:25 ` H. Nikolaus Schaller
2016-01-13 14:55 ` Nishanth Menon
[not found] ` <56966558.1070608-l0cyMroinI0@public.gmane.org>
2016-01-13 15:14 ` Grygorii Strashko
2016-01-13 16:48 ` Tony Lindgren
2016-01-13 17:12 ` Grygorii Strashko
2016-01-13 17:38 ` Nishanth Menon
2016-01-13 18:00 ` H. Nikolaus Schaller
2016-01-13 18:23 ` Nishanth Menon
2016-01-13 17:29 ` Nishanth Menon
2016-01-13 18:00 ` Tony Lindgren
[not found] ` <20160113180006.GJ12777-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2016-01-13 18:08 ` H. Nikolaus Schaller
[not found] ` <2B99611A-5D2E-4D17-A17D-0150516109FD-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
2016-01-13 18:31 ` Nishanth Menon [this message]
[not found] ` <56969800.5010206-l0cyMroinI0@public.gmane.org>
2016-01-13 18:44 ` H. Nikolaus Schaller
2016-01-13 19:05 ` Nishanth Menon
2016-01-13 19:22 ` Grygorii Strashko
2016-01-13 19:40 ` Tony Lindgren
2016-01-13 22:32 ` Nishanth Menon
2016-01-14 10:01 ` Keerthy
[not found] ` <56977211.8070206-l0cyMroinI0@public.gmane.org>
2016-01-14 17:39 ` Nishanth Menon
[not found] ` <5697DD4C.8010701-l0cyMroinI0@public.gmane.org>
2016-01-14 18:35 ` Tony Lindgren
2016-01-15 14:33 ` H. Nikolaus Schaller
2016-01-15 15:47 ` Tony Lindgren
[not found] ` <20160115154645.GA3904-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2016-01-15 17:10 ` Tony Lindgren
2016-01-15 18:11 ` H. Nikolaus Schaller
2016-08-25 2:43 ` Matthijs van Duin
2016-01-13 18:18 ` Nishanth Menon
2016-01-06 7:42 ` H. Nikolaus Schaller
[not found] ` <B2CEA92E-5F60-43C1-8265-F7C66FBD90D6-xXXSsgcRVICgSpxsJD1C4w@public.gmane.org>
2016-01-06 8:13 ` Laxman Dewangan
2016-01-06 14:36 ` Nishanth Menon
[not found] ` <568D2657.6050400-l0cyMroinI0@public.gmane.org>
2016-01-06 19:34 ` Rob Herring
[not found] ` <CAL_Jsq+rfU0EuoRi1Jkq2QYQjK0_LOW8PALatYccpbJiPPZh-g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-01-06 19:53 ` Nishanth Menon
2016-01-08 19:33 ` Rob Herring
2016-01-05 12:01 ` [PATCH 2/3] ARM: dts: omap5-board-common: enable iio gpadc for Palmas H. Nikolaus Schaller
2016-01-05 12:01 ` [PATCH 3/3] ARM: dts: twl6030: add gpadc H. Nikolaus Schaller
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