Unverified Commit 7ad9f3d0 authored by Ondrej Jirman's avatar Ondrej Jirman Committed by Maxime Ripard
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ARM: dts: sun8i-h3: Add thermal trip points/cooling maps 



This enables passive cooling by down-regulating CPU voltage
and frequency.

For trip points, I used a slightly lowered values from the BSP
code. The critical temperature of 110°C from BSP code seemed
like a lot, so I rounded it off to 100°C.

The critical trip point value is 30°C above the maximum recommended
ambient temperature (70°C) for the SoC from the datasheet, so there's
some headroom even at such a high ambient temperature.

Signed-off-by: default avatarOndrej Jirman <megous@megous.com>
Signed-off-by: default avatarMaxime Ripard <maxime@cerno.tech>
parent 4c7eeb9a

arch/arm/boot/dts/sun8i-h3.dtsi

+25 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ 
 */



#include "sunxi-h3-h5.dtsi"

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



/ {

	cpu0_opp_table: opp_table0 {
@@ -227,6 +228,30 @@ 
			polling-delay-passive = <0>;

			polling-delay = <0>;

			thermal-sensors = <&ths 0>;



			trips {

				cpu_hot_trip: cpu-hot {

					temperature = <80000>;

					hysteresis = <2000>;

					type = "passive";

				};



				cpu_very_hot_trip: cpu-very-hot {

					temperature = <100000>;

					hysteresis = <0>;

					type = "critical";

				};

			};



			cooling-maps {

				cpu-hot-limit {

					trip = <&cpu_hot_trip>;

					cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,

							 <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,

							 <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,

							 <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;

				};

			};

		};

	};

};