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: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Ondrej Jirman 2020-02-24 17:54:46 +01:00 committed by Maxime Ripard
parent 4c7eeb9af3
commit 7ad9f3d0cb
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@ -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>;
};
};
};
};
};