| Message ID | 20200224165446.334712-1-megous@megous.com (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 7ad9f3d0cb2f2b886c068f99e791bd41ceb0677a |
| Headers | show |
| Series | [v2] ARM: dts: sun8i-h3: Add thermal trip points/cooling maps | expand |
On Mon, Feb 24, 2020 at 05:54:46PM +0100, Ondrej Jirman wrote: > 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> Applied, thanks Maxime
diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi index 20217e2ca4d3a..e83aa6866e7ea 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 @@ cpu_thermal: cpu-thermal { 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>; + }; + }; }; }; };
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> --- arch/arm/boot/dts/sun8i-h3.dtsi | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) v2: - added more detail to the commit description