rcio-overlay.dts

/dts-v1/;
/plugin/;

/ {
        compatible = "brcm,bcm2709";

        fragment@0 {
                target = <&spi1>;
                __overlay__ {
                        #address-cells = <1>;
                        #size-cells = <0>;
                        status = "okay";

                        rcio@0 {
                                compatible = "rcio";
                                spi-max-frequency = <4000000>;
                                reg = <0>;
                                status = "okay";
                        };
                };
        };
};