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

From Nishanth Menon <nm@ti.com>
Newsgroups linux.kernel
Subject Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery
Date 2016-01-13 19:40 +0100
Message-ID <qQyuR-3Ce-5@gated-at.bofh.it> (permalink)
References (7 earlier) <qQvnk-1xE-7@gated-at.bofh.it> <qQwMs-2sp-51@gated-at.bofh.it> <qQxp9-2W5-29@gated-at.bofh.it> <qQy1Q-3qh-7@gated-at.bofh.it> <qQy1Q-3qh-5@gated-at.bofh.it>
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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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[PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-05 13:10 +0100
  Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-06 00:50 +0100
    Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-06 02:10 +0100
      Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-06 09:20 +0100
        Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-06 17:50 +0100
          Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-06 18:10 +0100
            Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-08 19:00 +0100
              Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-08 19:20 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-08 19:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-08 20:10 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-08 20:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-11 21:30 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-12 01:10 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-12 14:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-12 22:30 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-12 22:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-12 23:20 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-13 11:30 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-13 16:00 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-13 16:20 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-13 17:50 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-13 18:20 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-13 18:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-13 19:10 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-13 19:30 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-13 18:30 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-13 19:10 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-13 19:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-13 19:50 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-13 20:10 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-13 20:30 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-13 20:50 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <menon.nishanth@gmail.com> - 2016-01-13 23:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Keerthy <a0393675@ti.com> - 2016-01-14 11:10 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-14 18:50 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-14 19:40 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-13 19:10 +0100
                Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-13 19:20 +0100
        Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and  charging of backup battery Tony Lindgren <tony@atomide.com> - 2016-01-06 17:50 +0100
    Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging of backup battery "H. Nikolaus Schaller" <hns@goldelico.com> - 2016-01-06 08:50 +0100
      Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Laxman Dewangan <ldewangan@nvidia.com> - 2016-01-06 09:30 +0100
        Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-06 15:40 +0100
          Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Rob Herring <robh+dt@kernel.org> - 2016-01-06 20:40 +0100
            Re: [PATCH 1/3] ARM: dts: omap5-board-common: enable rtc and charging  of backup battery Nishanth Menon <nm@ti.com> - 2016-01-06 21:00 +0100

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