DzubyBB

Ok, i'm managed to do this using pwm on pin gpiox-5, overlay : 
 
/dts-v1/; /plugin/; / { compatible = "amlogic,a311d\0amlogic,g12a\0amlogic,g12b\0amlogic,sm1"; fragment@0 { target = <&pwm_cd>; __overlay__ { status = "okay"; pinctrl-0 = <&pwm_c_x5_pins>; pinctrl-names = "default"; }; }; fragment@1 { target-path = "/"; __overlay__ { fan0: pwm-fan { compatible = "pwm-fan"; pwms = <&pwm_cd 0 40000 0>; /* 25kHz frequency (40000ns period) */ cooling-min-state = <0>; cooling-max-state = <4>; #cooling-cells = <2>; cooling-levels = <26 52 102 153 204>; /* 10%, 20%, 40%, 60%, 80% duty cycles (out of 255) */ }; }; }; fragment@2 { target = <&cpu_thermal>; __overlay__ { polling-delay = <1000>; /* 1 second polling */ trips { cpu_fan_low: cpu-fan-low { temperature = <35000>; /* 35°C */ hysteresis = <2000>; /* 2°C */ type = "active"; }; cpu_fan_mid1: cpu-fan-mid1 { temperature = <40000>; /* 40°C */ hysteresis = <2000>; type = "active"; }; cpu_fan_mid2: cpu-fan-mid2 { temperature = <45000>; /* 45°C */ hysteresis = <2000>; type = "active"; }; cpu_fan_mid3: cpu-fan-mid3 { temperature = <50000>; /* 50°C */ hysteresis = <2000>; type = "active"; }; cpu_fan_high: cpu-fan-high { temperature = <55000>; /* 55°C */ hysteresis = <2000>; type = "active"; }; }; cooling-maps { map0 { trip = <&cpu_fan_low>; cooling-device = <&fan0 0 0>; /* 10% speed */ }; map1 { trip = <&cpu_fan_mid1>; cooling-device = <&fan0 1 1>; /* 20% speed */ }; map2 { trip = <&cpu_fan_mid2>; cooling-device = <&fan0 2 2>; /* 40% speed */ }; map3 { trip = <&cpu_fan_mid3>; cooling-device = <&fan0 3 3>; /* 60% speed */ }; map4 { trip = <&cpu_fan_high>; cooling-device = <&fan0 4 4>; /* 80% speed */ }; }; }; }; }; It has 5 levels of fan speed (10%, 20%, 40%, 60%, 80%) that depends on cpu temperature