# Customize

Source: [https://docs.qualcomm.com/doc/80-70015-30/topic/customize.html](https://docs.qualcomm.com/doc/80-70015-30/topic/customize.html)

For optimal performance of your product or application, it is important to customize
        and control its thermal behavior. You can configure a new thermal zone for a newly added
        external thermistor to control the surface temperature of Qualcomm Linux.

The following sample code shows how to configure a thermal zone using a device tree.

In the example, a temperature threshold of 50°C is monitored and mitigation is applied on
            the CPU cooling devices.
Note: By default a stepwise thermal
                governor is configured.

## Configure a new thermal zone

Parameters that are specific to the thermal zone are explained in [index: kernel/git/torvalds/linux.git](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/thermal/thermal-zones.yaml?h=v6.6).

    thermal-zones {<thermal zone name> {	polling-delay-passive = <2000>;	polling-delay = <0>;	thermal-sensors = < thermal sensor phandle and sensor specifier used to monitor this thermal zone>;	trips {		trip0: apc-trip {			temperature = <50000>;	/*Threshold to trigger thermal mitigation */			hysteresis = <2000>;	/*The offset of clear threshold, the clear threshold is 48000 */		};	};	cooling-maps {		map0 { 			 trip = <&apc_trip>;			 cooling-device = <&cpufreq-cpu4 THERMAL_NO_LIMIT 5>; /* Reduce Gold cluster CPU fmax freq by 5 levels */ 		};	};
        };
    };
    
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**Parent Topic:** [Thermal management](https://docs.qualcomm.com/doc/80-70015-30/topic/thermalmanagement.html)

Last Published: Oct 16, 2024

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