Re: [PATCH v2] pinctrl: Enable "power-source" to be extracted from DT files

[Linus Walleij]

On Tue, May 27, 2014 at 3:09 PM, Heiko StÃbner <heiko@xxxxxxxxx> wrote:
> Am Dienstag, 27. Mai 2014, 09:27:36 schrieb Ivan T. Ivanov:
>> From: "Ivan T. Ivanov" <iivanov@xxxxxxxxxx>
>>
>> Add "power-source" property to generic options used for DT parsing files.
>> This  enables drivers, which use generic pin configurations, to get the
>> value passed to this property.
>
> I think the main problem here is, that pinconf-generic.h defines the power-
> source as having a "custom format". With DT as a hardware description,
> implementaton specific values do not work well - instead it should have a
> regular unit-value.
>
> For the power-source I think volts could work well - as this is the main use-
> case for pinctrl I know. The regulator-binding uses microvolts, maybe it would
> be good use a similar unit.
(...)
>         pcfg_1v8 {
>                 power-source = <1800000>;
>         };

I don't think this is what it's meant for actually. In this case the thing would
be modeled as a regulator rather than some pin control option I guess?

I think it's more like a selector, such as found on old amplifiers,
input source A, B or C? So it's just some discrete number.

Then we don't know which voltage comes from power source A, B, C.

Yours,
Linus Walleij
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