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ARM: dts: ux500: Add thermistors to the HREF

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This adds the two temperature-monitoring thermistors to the
HREF reference design, defines a thermal zone for the
chassis and sets some reasonable thermal limits.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2020-12-12 11:46:26 +01:00
parent bc324d447f
commit 695055861a
1 changed files with 58 additions and 0 deletions
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58
arch/arm/boot/dts/ste-hrefv60plus.dtsi
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@ -10,6 +10,64 @@ / {
model = "ST-Ericsson HREF (v60+) platform with Device Tree";
compatible = "st-ericsson,hrefv60+", "st-ericsson,u8500";
thermal-zones {
chassis-thermal {
/* Poll every 20 seconds */
polling-delay = <20000>;
/* Poll every 2nd second when cooling */
polling-delay-passive = <2000>;
thermal-sensors = <&therm1>, <&therm2>;
/* Tripping points made from rough guess about operating conditions */
trips {
chassis_alert: chassis-alert {
/* At 50 degrees take down the CPU frequency */
temperature = <50000>;
hysteresis = <3000>;
type = "active";
};
chassis_crit: chassis-crit {
/* Just shut down at 70 degrees */
temperature = <70000>;
hysteresis = <2000>;
type = "critical";
};
};
/* Push down the operating frequency of the SoC when it gets hot */
cooling-maps {
map0 {
trip = <&chassis_alert>;
cooling-device = <&CPU0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
contribution = <100>;
};
};
};
};
/*
* Thermistors on the board, formally to monitor battery temperatures
* but what they measure is the board temperature.
*/
therm1: thermistor@0 {
compatible = "murata,ncp18wb473";
io-channels = <&gpadc 0x06>; /* AUX1 */
pullup-uv = <1800000>;
pullup-ohm = <220000>;
pulldown-ohm = <0>;
#thermal-sensor-cells = <0>;
};
therm2: thermistor@1 {
compatible = "murata,ncp18wb473";
io-channels = <&gpadc 0x07>; /* AUX2 */
pullup-uv = <1800000>;
pullup-ohm = <220000>;
pulldown-ohm = <0>;
#thermal-sensor-cells = <0>;
};
soc {
/* Name the GPIO muxed rails on the HREF boards */
gpio@8012e000 {