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I am not sure; the doc states that this (additionalProperties: false) "can't be used in case where another schema is referenced", which is the case here, as we include "panel-common.yaml".
This DT schema already list all relevant properties like:
backlight: true
So "additionalProperties: false" tells that no other properties are allowed other than the listed properties.
To my best understanding unevaluatedProperties: false is less strict and should be used if one does not list all possilbe properties. This could be the case for a panel haging below a SPI controller as in this case. So in other words giving this some extra thought I think unevaluatedProperties: false is OK here.
A panel below a SPI controller would have all its SPI-specific properties covered by spi-controller.yaml, I believe? So maybe "additionalProperties: false" would work?
In any case, if I use "additionalProperties: false", "make dt_binding_check" complains that my example's "spi-max-frequency" property is not covered. So maybe you are right.
So my r-b is ok if you keep it as it.
PS. Where do you guys hang out with the downfall of freenode - somewhere on oftc?
We moved to #opendingux on Libera.
Cheers, -Paul