/dts-v1/;
 /plugin/;

 / {
     compatible = "brcm,bcm2708", "brcm,bcm2709";

     fragment@0 {
         target = <&gpio>;
         __overlay__ {
             pinctrl-names = "default";
             pinctrl-0 = <&my_pins>;

             my_pins: my_pins {
                 brcm,pins = <7 8 9>;     /* gpio no. */
                 brcm,function = <0 0 0>; /* 0:in, 1:out */
                 brcm,pull = <1 1 2>;     /* 2:up 1:down 0:none */
             };
         };
     };
 };