PFUZE100 regulator not going off when PWRON is 0

PFUZE100 regulator not going off when PWRON is 0

[Jean-Michel Hautbois]

Hi,

I have a custom i.MX6 based board, but PMIC part is exactly the same
as the Freescale SabreSD board.
I have a reset button, which makes the PWRON signal on PFUZE100 go from 1 to 0.
I thought this would reset the chip, and thus all voltages would go to
0, but this is not the case. It seems that SWxOMODE registers are
involved in this process, accorgind to the datasheet, but I don't
think this is implemented right now.

I also removed regulator-always-on for my SW2 pin in order to get it
off, but this has no effect.

Thanks for your advices,
JM

Re: PFUZE100 regulator not going off when PWRON is 0

[Mark Brown]

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On Wed, Sep 03, 2014 at 11:44:22AM +0200, Jean-Michel Hautbois wrote:

> I have a custom i.MX6 based board, but PMIC part is exactly the same
> as the Freescale SabreSD board.
> I have a reset button, which makes the PWRON signal on PFUZE100 go from 1 to 0.
> I thought this would reset the chip, and thus all voltages would go to
> 0, but this is not the case. It seems that SWxOMODE registers are
> involved in this process, accorgind to the datasheet, but I don't
> think this is implemented right now.
> 
> I also removed regulator-always-on for my SW2 pin in order to get it
> off, but this has no effect.

You should really contact someone who worked on the driver or Freescale
about this - I don't think anyone on the CC list knows anything about
the part.  In general if you're asking about a specific driver this is a
good approach.  I've CCed Robin Gong who was the original author.

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Re: PFUZE100 regulator not going off when PWRON is 0

[Robin Gong]

Thanks for Mark's forward.

Hi Jean-Michel,
  Yes, SWxOMODE can be set as 1 to active sleep mode if PWRON turn-off event
occurs. And the voltage of sleep mode can be set in other register SWxOFF. But
by default, SWxOMODE is 0 which means all SW will be turned off while PWRON go
form 1 to 0. For your issue, I hope you check the hardware design, and measure
PWRON pin to see whether it has been pulled low once your push reset key.

On Wed, Sep 03, 2014 at 01:52:48PM +0100, Mark Brown wrote:
> On Wed, Sep 03, 2014 at 11:44:22AM +0200, Jean-Michel Hautbois wrote:
> 
> > I have a custom i.MX6 based board, but PMIC part is exactly the same
> > as the Freescale SabreSD board.
> > I have a reset button, which makes the PWRON signal on PFUZE100 go from 1 to 0.
> > I thought this would reset the chip, and thus all voltages would go to
> > 0, but this is not the case. It seems that SWxOMODE registers are
> > involved in this process, accorgind to the datasheet, but I don't
> > think this is implemented right now.
> > 
> > I also removed regulator-always-on for my SW2 pin in order to get it
> > off, but this has no effect.
> 
> You should really contact someone who worked on the driver or Freescale
> about this - I don't think anyone on the CC list knows anything about
> the part.  In general if you're asking about a specific driver this is a
> good approach.  I've CCed Robin Gong who was the original author.


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Re: PFUZE100 regulator not going off when PWRON is 0

[Jean-Michel Hautbois]

2014-09-09 4:41 GMT+02:00 Robin Gong <b38343-KZfg59tc24xl57MIdRCFDg@public.gmane.org>:
> Thanks for Mark's forward.
>
> Hi Jean-Michel,
>   Yes, SWxOMODE can be set as 1 to active sleep mode if PWRON turn-off event
> occurs. And the voltage of sleep mode can be set in other register SWxOFF. But
> by default, SWxOMODE is 0 which means all SW will be turned off while PWRON go
> form 1 to 0. For your issue, I hope you check the hardware design, and measure
> PWRON pin to see whether it has been pulled low once your push reset key.

Thank you both, we found an electrical issue which made it not going down to 0V.
Regards,
JM
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