diff options
| author | Dmitry Osipenko <digetx@gmail.com> | 2021-05-10 23:25:56 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2021-05-31 11:56:15 +0300 |
| commit | 2e09908f37c34356baae72f047bbb8fc9faac32f (patch) | |
| tree | d3f78a928941a40d79121ba2ed5552ec2fb898a1 /arch/arm/boot/dts/tegra20-paz00.dts | |
| parent | 5f45da704de425d74abd75feaa928fc8a3df03ba (diff) | |
| download | linux-2e09908f37c34356baae72f047bbb8fc9faac32f.tar.xz | |
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: Agneli <poczt@protonmail.ch>
Tested-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'arch/arm/boot/dts/tegra20-paz00.dts')
| -rw-r--r-- | arch/arm/boot/dts/tegra20-paz00.dts | 42 |
1 files changed, 40 insertions, 2 deletions
diff --git a/arch/arm/boot/dts/tegra20-paz00.dts b/arch/arm/boot/dts/tegra20-paz00.dts index 63d62418d4b8..3180bff90756 100644 --- a/arch/arm/boot/dts/tegra20-paz00.dts +++ b/arch/arm/boot/dts/tegra20-paz00.dts @@ -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 @@ }; }; - adt7461@4c { + adt7461: temperature-sensor@4c { compatible = "adi,adt7461"; reg = <0x4c>; + #thermal-sensor-cells = <1>; }; }; @@ -655,11 +658,46 @@ 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>; + }; + }; }; }; }; |