[U-Boot] [PATCH v3 00/54] dm: Introduce new driver model uclasses

[Tom Rini]

On Tue, Jun 30, 2015 at 01:10:45PM -0700, York Sun wrote:
> 
> 
> On 06/30/2015 12:01 PM, Tom Rini wrote:
> > On Tue, Jun 30, 2015 at 11:42:41AM -0700, York Sun wrote:
> >>
> >>
> >> On 06/30/2015 11:33 AM, Simon Glass wrote:
> >>> Hi York,
> >>>
> >>> On 30 June 2015 at 10:08, York Sun <yorksun at freescale.com> wrote:
> >>>> Simon,
> >>>>
> >>>> Does the dm force using device tree? I was reviewing a patch set regarding SPI
> >>>> and found OF_CONTROL has to be selected in order to get the driver model happy.
> >>>>
> >>>> My understanding of the driver model is both device tree and platform data are
> >>>> allowed, like Linux. Is that still true?
> >>>
> >>> For buses you need device tree. I was rather hoping that we could
> >>> avoid platform data on platforms that have device tree. What is the
> >>> point?
> >>>
> >>
> >> Simon,
> >>
> >> It happens on a platform not using device tree, but DM will be used.
> >>
> >> I prefer DM to have both, rather than being forced to use device tree, unless we
> >> are going to enforce using device tree on all new platforms. Since device tree
> >> is still an option, I feel it is best to support platform data, like Linux
> >> drivers do.
> > 
> > Well, to what end?  My recollection is that in short, the kernel has
> > both since platform data predates device tree (and converting platform
> > data to device tree is still a thing that happens).  But we're trying to
> > skip that intermediate step.  Are there platforms where you do not plan
> > to use a device tree, ever?
> > 
> 
> Tom,
> 
> I am not against using device tree at all. It is more dynamic and flexible. But
> I don't see any indication that we favor device tree over pdata (except in the
> code). If we are skipping pdata for new drivers, a clear message will be
> helpful. That's what I am trying to get clarification.

OK.  I think we'd agreed to that at ELC-E last year and it might have
been in a few here-and-there emails but it's worth spelling out
somewhere.

Hey Simon?  doc/driver-model/README.txt has a pdata example, so maybe
the answer here is it's time to update README.txt in a few ways :)

-- 
Tom
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