Re: [PATCH v2 1/2] dt-bindings: arm:?==?utf-8?q? rockchip: Add Asus Tinker Board 3 and 3S

[Dragan Simic]

Hello Michael,

On Tuesday, November 18, 2025 06:27 CET, Michael Opdenacker <michael.opdenacker at rootcommit.com> wrote:
> On 11/15/25 01:52, Dragan Simic wrote:
> > I'm sorry again for not mentioning it in my earlier responses,
> > but shouldn't this addition be specified like below:
> >
> >       - description: Asus Tinker Board 3/3S
> >         items:
> >           - enum:
> > 	          - asus,rk3566-tinker-board-3
> >             - asus,rk3566-tinker-board-3s
> >           - const: rockchip,rk3566
> >
> > ... because the introduced .dts files define the actual board DTs,
> > by descending from the common .dtsi file, while they're compatible
> > in the sense of the 3S board variant extending the 3 variant.
> 
> Actually, "make dtbs_check" fails if rk3566-tinker-board-3s.dts has:
> compatible = "asus,rk3566-tinker-board-3s", 
> "asus,rk3566-tinker-board-3", "rockchip,rk3566";
> 
> The failure is:
> arch/arm64/boot/dts/rockchip/rk3566-tinker-board-3s.dtb: / 
> (asus,rk3566-tinker-board-3s): compatible: 'oneOf' conditional failed, 
> one must be fixed:
>      ['asus,rk3566-tinker-board-3s', 'asus,rk3566-tinker-board-3', 
> 'rockchip,rk3566'] is too long
>      ['asus,rk3566-tinker-board-3s', 'asus,rk3566-tinker-board-3', 
> 'rockchip,rk3566'] is too short

Oh, I missed that completely, thanks for running the checks.

> If I understand correctly, to keep the rk3566-tinker-board-3s.dts file 
> as it is, you need Asus Tinker Board 3 and 3S to have two different 
> descriptions as in V2:
> 
> - description: Asus Tinker Board 3 items: - const: 
> asus,rk3566-tinker-board-3 - const: rockchip,rk3566 - description: Asus 
> Tinker Board 3S items: - const: asus,rk3566-tinker-board-3s - const: 
> asus,rk3566-tinker-board-3 - const: rockchip,rk3566
> 
> The other solution is to remove the "asus,rk3566-tinker-board-3" 
> compatible from rk3566-tinker-board-3s.dts, which is not a big deal in 
> my opinion. In addition, if some code turns out to work only on 3 but 
> not on 3S, though that's not expected if 3S is indeed a superset of 3, 
> we won't be stuck.
> 
> I can submit a V3 along these lines.

This should let us keep the "asus,rk3566-tinker-board-3" compatible
in the new rk3566-tinker-board-3s.dts board dts while satisfying the
validation properly:

  - description: Asus Tinker Board 3/3S
    items:
    - enum:
        - asus,rk3566-tinker-board-3s
    - const: asus,rk3566-tinker-board-3
    - const: rockchip,rk3566

I'm quite busy at the moment, hence my delayed response, and I also
apologize for not running the checks on the above-proposed solution,
but I think it should work as expected.