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.
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