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| author | Ondrej Jirman <megous@megous.com> | 2020-02-24 19:54:46 +0300 |
|---|---|---|
| committer | Maxime Ripard <maxime@cerno.tech> | 2020-02-25 12:04:23 +0300 |
| commit | 7ad9f3d0cb2f2b886c068f99e791bd41ceb0677a (patch) | |
| tree | 13ddc944f239883b47dfe0c766494ae96de6a7fc /arch/arm/boot | |
| parent | 4c7eeb9af3e41ae7d840977119c58f3bbb3f4f59 (diff) | |
| download | linux-7ad9f3d0cb2f2b886c068f99e791bd41ceb0677a.tar.xz | |
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>
Diffstat (limited to 'arch/arm/boot')
| -rw-r--r-- | arch/arm/boot/dts/sun8i-h3.dtsi | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi index 20217e2ca4d3..e83aa6866e7e 100644 --- a/arch/arm/boot/dts/sun8i-h3.dtsi +++ b/arch/arm/boot/dts/sun8i-h3.dtsi @@ -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>; + }; + }; }; }; }; |