hello alexisguiter,
please refer to Thermal Zone session to have customization in the device tree.
you might also access L4T sources from download center, check below documentation for several examples to use device tree bindings.
for example,
$L4T_Sources/r32.4.2/Linux_for_Tegra/source/public/kernel/kernel-4.9/Documentation/devicetree/bindings/thermal/thermal.txt