Re: [RFC v2 5/5] drm: Add NVIDIA Tegra support

[Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>]

On 05/07/2012 02:50 AM, Terje Bergström wrote:
> On 25.04.2012 12:45, Thierry Reding wrote:
> 
>> +/ {
>> +       ...
>> +
>> +       /* host1x */
>> +       host1x: host1x@50000000 {
>> +               compatible = "nvidia,tegra20-host1x";
>> +               reg = <0x50000000 0x00024000>;
>> +               interrupts = <0 64 0x04   /* cop syncpt */
>> +                             0 65 0x04   /* mpcore syncpt */
>> +                             0 66 0x04   /* cop general */
>> +                             0 67 0x04>; /* mpcore general */
>> +       };
>> +
>> +       /* video-encoding/decoding */
>> +       mpe@54040000 {
>> +               reg = <0x54040000 0x00040000>;
>> +               interrupts = <0 68 0x04>;
>> +       };
>> +
> 
> (...)
> 
> 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.