Odtnhj

In the dts file of my kernel, I have:

thermal-zones 
 cpu0_thermal: cpu0-thermal 
 thermal-sensors = <&tmuctrl_0>;
 polling-delay-passive = <1000>;
 polling-delay = <1000>;
 trips 
 cpu_alert0: cpu-alert-0 
 temperature = <100000>;
 hysteresis = <1000>;
 type = "active";
 ;
 cpu_alert1: cpu-alert-1 
 temperature = <110000>;
 hysteresis = <1000>;
 type = "passive";
 ;
 cpu_alert2: cpu-alert-2 
 temperature = <120000>;
 hysteresis = <1000>;
 type = "passive";
 ;
 cpu-crit-0 
 temperature = <130000>;
 hysteresis = <1000>;
 type = "critical";
 ;
 ;

 cooling-maps 
 map0 
 trip = <&cpu_alert0>;
 cooling-device = <&cpu0 1 1>;
 ;
 map1 
 trip = <&cpu_alert1>;
 cooling-device = <&cpu0 4 4>;
 ;
 map2 
 trip = <&cpu_alert2>;
 cooling-device = <&cpu0 10 10>;
 ;
 ;
 ;
;

It seems that passive means only CPU is used, active means any FAN cooling-device is used.

My question: what do the two figures represent in the cooling-device of the CPU?

https://www.kernel.org/doc/Documentation/devicetree/bindings/thermal/thermal.txt says: "Cooling states are referred to by single unsigned integers, where larger numbers mean greater heat dissipation."

But what is 1, 4 and 10? Would this apply only if cpufreq is ondemand? How are the "cooling" frequencies calculated? is there another part of the DTS that is linked to those values?

I'm not totally sure if it's generic or specific to my ARM device, but I figured out by reading commit comments that the number (1, 4, 10) correspond to throttle of the CPU only in ondemand mode. In my particular case, those numbers represent a measure of throttle in 100MHz. Therefore, 10 means that the CPU is throttle at 1GHz less than its maximum frequency.