Re: [PATCH 6/7] dt-bindings: display: allwinner: Update H616 DE33 binding

Krzysztof Kozlowski
2025-11-16T11:34:01Z

On 16/11/2025 12:33, Krzysztof Kozlowski wrote:
> On Sat, Nov 15, 2025 at 03:13:46PM +0100, Jernej Skrabec wrote:
>> As it turns out, current H616 DE33 binding was written based on
>> incomplete understanding of DE33 design. Namely, planes are shared
>> resource and not tied to specific mixer, which was the case for previous
>> generations of Display Engine (DE3 and earlier).
>>
>> This means that current DE33 binding doesn't properly reflect HW and
>> using it would mean that second mixer (used for second display output)
>> can't be supported.
>>
>> Update DE33 mixer binding so instead of referencing planes register
>> space, it contains phandle to newly introduced DE33 planes node.
>>
>> There is no user of this binding yet, so changes can be made safely,
>> without breaking any backward compatibility.
>
> And why would you configure statically - per soc - always the same plane
> as per mixer? If you do that, it means it is really fixed and internal
> to display engine thus should not be exposed in DT.
>
> Describing each IP block resource in DT is way too granular.
>

BTW, everything is update, thus subject is really non-informative.

Best regards,
Krzysztof