zmk_mf68/boards/shields/petejohanson_handwire/petejohanson_handwire.overlay

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/ {
kscan {
compatible = "gpio-kscan";
label = "Handwired GPIO KSCAN matrix";
row-gpios = <&arduino_header 8 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
<&arduino_header 10 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
col-gpios = <&arduino_header 13 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>,
<&arduino_header 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
};
};