Re: [PATCH v2] dt-bindings: gpio: pca95xx: add onnn,pca9655 compatible

[Krzysztof Kozlowski]

On Sun, Oct 04, 2026 at 12:10:42PM -0700, Rosen Penev wrote:
> The pca9655 is the On Semi variant of the pca9555 16-bit I2C GPIO
> expander. "onnn,pca9655" is already used standalone by in-tree DTS

"Already" is a stretch - YOU added it here:
https://lore.kernel.org/all/20260905000415.153682-1-rosenp@xxxxxxxxx/

and that patch explained nothing about missing compatible documentation.
That patch should clearly document missing binding, so the SoC
maintainer would not pick it up.

> (armada-388-clearfog, armada-388-helios4) and has a dedicated entry in
> the pca953x driver's OF match table, but was never documented, causing
> dtbs_check failures.
> 
> Document it alongside the other standalone entries such as
> onnn,pca9654, without an nxp,pca9555 fallback, so that the existing
> DTS remain valid.

There is no existing DTs, git grep. Next is not existing, because I can
reject that DTS pull.

And what about clear comment in mainline:

 * This is how it should be:
 * compatible = "onnn,pca9655", "nxp,pca9555";
 * but you can't do this because of the way I2C works.

 Best regards,
 Krzysztof