Save the file as OC.dts, activate via armbian-add-overlay
/dts-v1/;
/plugin/;
/ {
compatible = "radxa,zero3";
fragment@0 {
target-path = "/opp-table-0";
__overlay__ {
opp-20000000000 {
opp-supported-hw = <0xf9 0xffff>;
opp-hz = /bits/ 64 <2000000000>;
opp-microvolt = <1300000 1300000 1300000>;
clock-latency-ns = <0x9c40>;
};
};
};
};
Further support links: [SOLVED] Zero 3E PWM GPIO under Kernel 6.1 Ubuntu