dt-bindings: mfd: samsung,s2mps11: Add comment about interrupts properties

Document why the binding uses oneOf when specifying just one of the
interrupt properties is supposed to be enough.

dtschema's fixups.py has special treatment of the interrupts and
interrupts-extended properties, but that appears to work at the top
level only. Elsewhere, an explicit oneOf is required.

Signed-off-by: André Draszik <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: andred

Documentation/devicetree/bindings/mfd/samsung,s2mps11.yaml

@@ -81,6 +81,9 @@ allOf:
         samsung,s2mps11-acokb-ground: false
         samsung,s2mps11-wrstbi-ground: false
 
+      # oneOf is required, because dtschema's fixups.py doesn't handle this
+      # nesting here. Its special treatment to allow either interrupt property
+      # when only one is specified in the binding works at the top level only.
       oneOf:
         - required: [interrupts]
         - required: [interrupts-extended]