Re: [PATCH] regulator: twl: mark vdd1/2 as continuous on twl4030

Andreas Kemnade
2019-06-17T17:21:16Z

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On Mon, 17 Jun 2019 18:02:55 +0100
Mark Brown <broonie@kernel.org> wrote:

> On Mon, Jun 17, 2019 at 06:27:43PM +0200, Andreas Kemnade wrote:
>
> > Citing tps65950 trm page 55:
>
> > The device contains three switch-mode power supplies (SMPS):
> > • VDD1: 1.2-A, buck DC/DC converter (VOUT = 0.6 V to 1.45 V, in steps of 12.5 mV)
> > • VDD2: 600-mA buck DC/DC converter (VOUT = 0.6 V to 1.45 V, in steps of 12.5 mV, and 1.5 V as a
> > single programmable value)
>
> > you are right, they are not really continuous. So should I add these
> > 68 steps they have as a voltage list?
>
> There's helpers for linear mappings, you should be able to use those
> (see helpers.c).
>
ok, I will send a 2 with such a list.

Thanks for the hint.

> > I think they are nearly continuous, so we should IMHO rather take that
> > not that strict. I guess there are no really continuous regulators, all
> > have steps as voltage is specified in a limited resolution. So what is
> > the exact meaning of that flag here?
>
> This was added for devices with extremely high resolution interfaces
> like some microcontroller interfaces that take voltage values directly
> (mirroring the regulator API) or PWM regulators - it's for cases where
> enumerating all the voltages is unreasonable. The TWL4030 regulators
> look fairly standard in comparison.

well, VDD1 is a lot more continuous than e.g. VAUX3, but your examples
seem to be even more continuous. But maybe a comment in the api documentation
might be helpful so that people do not misinterpret the meaning.

Regards,
Andreas

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