PMIC driver prevents gpio-leds to work

PMIC driver prevents gpio-leds to work

[Fabio Estevam]

Hi,

I am running into the following issue on imx6sl-evk.dts:

- I can only get the user GPIO LED to work if I unselect the PFUZE100
PMIC driver

- This happens on linux-next as well as in the internal FSL kernel based on 3.10

With CONFIG_REGULATOR_PFUZE100=y then the LED blinks only once and
stops instead of blinking at the heartbeat rate.

Changing to CONFIG_REGULATOR_PFUZE100=n then the LED blinks normally.

I am not sure how the PMIC driver could interact and make the
gpio-leds driver to fail.

Any suggestions?

Thanks,

Fabio Estevam

Re: PMIC driver prevents gpio-leds to work

[Alexander Shiyan]

???????, 18 ??????? 2014, 15:20 -03:00 ?? Fabio Estevam <festevam@gmail.com>:
> Hi,
> 
> I am running into the following issue on imx6sl-evk.dts:
> 
> - I can only get the user GPIO LED to work if I unselect the PFUZE100
> PMIC driver
> 
> - This happens on linux-next as well as in the internal FSL kernel based on 3.10
> 
> With CONFIG_REGULATOR_PFUZE100=y then the LED blinks only once and
> stops instead of blinking at the heartbeat rate.
> 
> Changing to CONFIG_REGULATOR_PFUZE100=n then the LED blinks normally.
> 
> I am not sure how the PMIC driver could interact and make the
> gpio-leds driver to fail.
> 
> Any suggestions?

Perhaps, one of regulators turn off the power for a pin-group where LED is connected.

---

PMIC driver prevents gpio-leds to work

[Fabio Estevam]

On Tue, Feb 18, 2014 at 3:43 PM, Alexander Shiyan <shc_work@mail.ru> wrote:
> ???????, 18 ??????? 2014, 15:20 -03:00 ?? Fabio Estevam <festevam@gmail.com>:
>> Hi,
>>
>> I am running into the following issue on imx6sl-evk.dts:
>>
>> - I can only get the user GPIO LED to work if I unselect the PFUZE100
>> PMIC driver
>>
>> - This happens on linux-next as well as in the internal FSL kernel based on 3.10
>>
>> With CONFIG_REGULATOR_PFUZE100=y then the LED blinks only once and
>> stops instead of blinking at the heartbeat rate.
>>
>> Changing to CONFIG_REGULATOR_PFUZE100=n then the LED blinks normally.
>>
>> I am not sure how the PMIC driver could interact and make the
>> gpio-leds driver to fail.
>>
>> Any suggestions?
>
> Perhaps, one of regulators turn off the power for a pin-group where LED is connected.

That did the trick, thanks.

I thought that 'regulator-always-on' was enough, but I also need
'regulator-boot-on' as well.

Will submit the patch later today.

Thanks,

Fabio Estevam

PMIC driver prevents gpio-leds to work

[Mark Brown]

On Tue, Feb 18, 2014 at 03:59:27PM -0300, Fabio Estevam wrote:

> I thought that 'regulator-always-on' was enough, but I also need
> 'regulator-boot-on' as well.

That sounds wrong, like something is forgetting to do an enable at some
point or there's some problem with the enable operation.  What's the
actual root cause here?  boot-on should really only be needed for
regulators where you can't read the status.
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PMIC driver prevents gpio-leds to work

[Fabio Estevam]

On Wed, Feb 19, 2014 at 12:38 AM, Mark Brown <broonie@kernel.org> wrote:
> On Tue, Feb 18, 2014 at 03:59:27PM -0300, Fabio Estevam wrote:
>
>> I thought that 'regulator-always-on' was enough, but I also need
>> 'regulator-boot-on' as well.
>
> That sounds wrong, like something is forgetting to do an enable at some
> point or there's some problem with the enable operation.  What's the
> actual root cause here?  boot-on should really only be needed for
> regulators where you can't read the status.

Thanks for your explanation, Mark.

Sent v2 of the patch.

Regards,

Fabio Estevam