Re: [PATCH v2 1/3] devicetree: mfd: Add binding for the TI LM3533

From: Bjorn Andersson
Date: Fri Oct 30 2015 - 17:17:12 EST

On Fri 30 Oct 13:18 PDT 2015, Rob Herring wrote:

> On Fri, Oct 30, 2015 at 2:41 PM, Bjorn Andersson
> <bjorn.andersson@xxxxxxxxxxxxxx> wrote:
> > On Fri 30 Oct 11:42 PDT 2015, Lee Jones wrote:
> >
> > Rob, please see the discussion regarding ti,boost-freq-khz below. Should
> > we both specify unit at the same time as we use standard units? (This is
> > not the first time I have to change this back and forth)
> >
> >> On Tue, 27 Oct 2015, Bjorn Andersson wrote:
> >>
> > The ti,boost-low-freq from the bq25890 binding is the only other
> > property I can find that describes the same thing. So I'm not sure I
> > follow you here.
> >
> >> Perhaps we need to create a set of generic bindings.
> >>
> >> Also, we usually measure DT bindings in HZ, not kHz.
> Surprisingly, there are not enough examples to draw much conclusion.
> > I thought we had defined frequencies to be in HZ and HZ only, but then
> > Rob's comment that I need to actually specify the unit doesn't make any
> > sense.
> I don't think we decided, but let's decide now. Go with Hz.


> Really, I first prefer the property name has units and second having
> standardized units. But if there is a common property without units, I
> prefer that even more.

You can find this property in a variety of hardware, but I don't think
it would make much sense to define this single property in a common
place today.

This seems to be the first case where we specify the unit on one of
these properties though.

> > Do we want these properties in a standard unit or do we want them
> > specifying the unit? Having both seems excessive.
> You mean "freq" would imply the units? No, we want the actual units in
> the property.

You're right, frequency can be measured in other units than Hz, I can't
think of one that would be applicable here though.

Either way, I'll slap on a unit to the property name - Hz that is...

Thanks for your input.

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