Tegra DRM device tree bindings

[Mark Zhang]

> On 06/26/2012 07:46 PM, Mark Zhang wrote:
> >>> On Tue, 26 Jun 2012 12:55:13 +0200
> >>> Thierry Reding <thierry.reding at avionic-design.de> wrote:
> ...
> >> I'm not sure I understand how information about the carveout would be
> >> obtained from the IOMMU API, though.
> >
> > I think that can be similar with current gart implementation. Define carveout as:
> >
> > carveout {
> >         compatible = "nvidia,tegra20-carveout";
> >         size = <0x10000000>;
> > };
> >
> > Then create a file such like "tegra-carveout.c" to get these definitions and
> register itself as platform device's iommu instance.
> 
> The carveout isn't a HW object, so it doesn't seem appropriate to define a DT
> node to represent it.
> --

Yes. But I think it's better to export the size of carveout as a configurable item.
So we need to define this somewhere. How about define carveout as a property of gart?

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