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All nodes need an explicit additionalProperties or unevaluatedProperties
unless a $ref has one that's false.  Add missing additionalProperties
for serial-attached devices.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240811-dt-bindings-serial-peripheral-props-v1-1-1dba258b7492@linaro.org

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>