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 <york...@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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