Re: [PATCH v3 0/5] Introduce "non-pixel" sub node within iris video node

Krzysztof Kozlowski
2025-10-09T01:04:36Z

On 09/10/2025 09:55, Bryan O'Donoghue wrote:
> On 09/10/2025 01:47, Krzysztof Kozlowski wrote:
>>> Maybe it would be possible to also use an inferred FUNCTION_ID somehow
>>> though TBH I think that's a work-around.
>> Three months ago I gave you the answer for that - it is inferred by
>> index on the list.
>
> But at least as I understand it, you can have multiple SID entries that
> need to map to a FUNCTION_ID which means you need to encode that
> inferred indexing in your driver.

Yes.

>
> So you can't have the iommu code just know what to do.. it has to be
> driver specific.

Yes.

>
> The iommu description for this platform basically lacks the data that
> _should_ be there -> FUNCTION_ID.

No. The index tells that already.

>
> The rule is that the DT should really describe the hardware right ?

It already does. Same as I wrote on IRC, DT already has all the
information. Entry 0 has function ID-foo. Entry 1 has function ID-bar.
Entry 2 has function ID-bar or whatever.

Best regards,
Krzysztof