linux/Documentation/devicetree/bindings/arm/atmel-pmc.txt
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Prefs
   1* Power Management Controller (PMC)
   2
   3Required properties:
   4- compatible: Should be "atmel,at91rm9200-pmc"
   5- reg: Should contain PMC registers location and length
   6
   7Examples:
   8        pmc: pmc@fffffc00 {
   9                compatible = "atmel,at91rm9200-pmc";
  10                reg = <0xfffffc00 0x100>;
  11        };
  12