Commit 2e09908f authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Thierry Reding
Browse files

ARM: tegra: paz00: Add CPU thermal zone 



Add thermal zone with a passive cooling trip for CPU. Attach it to the
LM90 sensor which monitors CPU temperature. Now CPU frequencies will be
throttled once trip point is reached, preventing critical overheat.

Tested-by: default avatarAgneli <poczt@protonmail.ch>
Tested-by: default avatarPaul Fertser <fercerpav@gmail.com>
Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 5f45da70

arch/arm/boot/dts/tegra20-paz00.dts

+40 −2
Original line number Diff line number Diff line
@@ -2,6 +2,8 @@ 
/dts-v1/;



#include <dt-bindings/input/input.h>

#include <dt-bindings/thermal/thermal.h>



#include "tegra20.dtsi"

#include "tegra20-cpu-opp.dtsi"

#include "tegra20-cpu-opp-microvolt.dtsi"
@@ -498,9 +500,10 @@ ldo_rtc { 
			};

		};



		adt7461@4c {

		adt7461: temperature-sensor@4c {

			compatible = "adi,adt7461";

			reg = <0x4c>;

			#thermal-sensor-cells = <1>;

		};

	};
@@ -655,11 +658,46 @@ cpus { 
		cpu0: cpu@0 {

			cpu-supply = <&cpu_vdd_reg>;

			operating-points-v2 = <&cpu0_opp_table>;

			#cooling-cells = <2>;

		};



		cpu@1 {

		cpu1: cpu@1 {

			cpu-supply = <&cpu_vdd_reg>;

			operating-points-v2 = <&cpu0_opp_table>;

			#cooling-cells = <2>;

		};

	};



	thermal-zones {

		cpu-thermal {

			polling-delay-passive = <500>; /* milliseconds */

			polling-delay = <1500>; /* milliseconds */



			thermal-sensors = <&adt7461 1>;



			trips {

				trip0: cpu-alert0 {

					/* start throttling at 80C */

					temperature = <80000>;

					hysteresis = <200>;

					type = "passive";

				};



				trip1: cpu-crit {

					/* shut down at 85C */

					temperature = <85000>;

					hysteresis = <2000>;

					type = "critical";

				};

			};



			cooling-maps {

				map0 {

					trip = <&trip0>;

					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,

							 <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;

				};

			};

		};

	};

};