Re: [RFC 00/15] ACPI graph support

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On Wed, Oct 05, 2016 at 06:32:29PM +0300, Mika Westerberg wrote:
> On Wed, Oct 05, 2016 at 04:06:41PM +0100, Lorenzo Pieralisi wrote:
> > On Wed, Oct 05, 2016 at 02:41:29PM +0300, Mika Westerberg wrote:
> > > On Wed, Oct 05, 2016 at 10:22:15AM +0100, Lorenzo Pieralisi wrote:
> > > > On Wed, Oct 05, 2016 at 01:45:33AM +0300, Sakari Ailus wrote:
> > > The whole purpose of PRP0001 ID is to allow DT bindings to be reused in
> > > ACPI systems, so that the drivers can just call device_property_* and
> > > get the properties regardless of the underlying firmware interface.
> > > 
> > > Are you saying that's not wanted?
> > 
> > Not wholesale DT bindings import into ACPI, just no way.
> 
> Of course not all DT bindings. Only those that do not have a native ACPI
> representation.

... yet.

For self-contained devices, this isn't much of a concern, but inter-device
relationships are the sort of thing ACPI *needs* to know about, and define a
model for. By trying to bodge this into _DSD, we're making matters worse by
both delaying the inevitable and creating a tonne of technical debt that we
have to deal with forever.

By copying DT, but changing a few things, we're in effect creating a new
ill-defined Linux-specific standard. If we're going to create a new standard,
we should go through the ASWG, and make an actual standard. If we're not going
to create a new standard, we should use DT directly, rather than trying to
force DT into ACPI.

Thanks,
Mark.
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