x1e-nixos/kernel/dtb-overlays/surface-laptop-7-thermal.dts

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Surface Laptop 7 CPU thermal throttling overlay. Adds #cooling-cells
 * to CPU nodes and passive trip points at 85 °C (5 °C hysteresis) so
 * cpufreq cooling is registered and step_wise throttling kicks in.
 */

/dts-v1/;
/plugin/;

#define THERMAL_NO_LIMIT 0xffffffff

/ {
	compatible = "microsoft,romulus13", "microsoft,romulus15", "qcom,x1e80100";
};

&cpu0  { #cooling-cells = <2>; };
&cpu1  { #cooling-cells = <2>; };
&cpu2  { #cooling-cells = <2>; };
&cpu3  { #cooling-cells = <2>; };
&cpu4  { #cooling-cells = <2>; };
&cpu5  { #cooling-cells = <2>; };
&cpu6  { #cooling-cells = <2>; };
&cpu7  { #cooling-cells = <2>; };
&cpu8  { #cooling-cells = <2>; };
&cpu9  { #cooling-cells = <2>; };
&cpu10 { #cooling-cells = <2>; };
&cpu11 { #cooling-cells = <2>; };

&{/thermal-zones/cpu0-0-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu0_0_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu0_0_passive>;
			cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu0-1-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu0_1_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu0_1_passive>;
			cooling-device = <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu0-2-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu0_2_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu0_2_passive>;
			cooling-device = <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu0-3-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu0_3_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu0_3_passive>;
			cooling-device = <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu1-0-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu1_0_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu1_0_passive>;
			cooling-device = <&cpu4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu1-1-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu1_1_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu1_1_passive>;
			cooling-device = <&cpu5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu1-2-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu1_2_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu1_2_passive>;
			cooling-device = <&cpu6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu1-3-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu1_3_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu1_3_passive>;
			cooling-device = <&cpu7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu2-0-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu2_0_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu2_0_passive>;
			cooling-device = <&cpu8 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu2-1-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu2_1_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu2_1_passive>;
			cooling-device = <&cpu9 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu2-2-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu2_2_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu2_2_passive>;
			cooling-device = <&cpu10 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};

&{/thermal-zones/cpu2-3-top-thermal} {
	polling-delay-passive = <250>;
	polling-delay = <1000>;
	trips {
		cpu2_3_passive: trip-passive {
			temperature = <85000>;
			hysteresis = <5000>;
			type = "passive";
		};
	};
	cooling-maps {
		map0 {
			trip = <&cpu2_3_passive>;
			cooling-device = <&cpu11 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
		};
	};
};