[RFC v2 5/5] drm: Add NVIDIA Tegra support
thierry.reding at avionic-design.de
Mon May 21 04:05:14 PDT 2012
* Stephen Warren wrote:
> On 05/07/2012 02:50 AM, Terje Bergström wrote:
> > Hi Thierry,
> > I have still lots of questions regarding how device trees work. I'm now
> > just trying to match the device tree structure with hardware - let me
> > know if that goes wrong.
> > There's a hierarchy in the hardware, which should be represented in the
> > device trees. All of the hardware are client modules for host1x - with
> > the exception of host1x obviously. CPU has two methods for accessing the
> > hardware: clients' register aperture and host1x channels. Both of these
> > operate via host1x hardware.
> > We should define host1x bus in the device tree, and move all nodes
> > except host1x under that bus.
> I think the host1x node /is/ that bus.
I agree. It's really just a "simple-bus" kind of bus. Except that it'll need
another compatible value to make the host1x driver bind to it. But we should
be able to make it work without creating a completely new bus. I guess the
"ranges" property could specify 0x54000000 as the base address and child
nodes could use offsets relative to that. Maybe even that is overkill,
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