Hi Krzysztof, Thanks for the review. > > properties: > > compatible: > > - enum: > > - - ti,opt3001 > > - - ti,opt3002 > > + oneOf: > > + - enum: > > + - ti,opt3001 > > + - ti,opt3002 > > + - items: > > + - const: ti,opt3001 > > + - const: ti,opt3004 > > 3004 is not the fallback. Do you mean I need to reverse the order? items: - const: ti,opt3004 - const: ti,opt3001 Is it correct? Best Regards, Hardev