The thermal zone uses spmi-temp-alarm as sensor. If the sensor is
configured without an IIO input it always reports 37°C for temperatures
below the first hardware trip point at 105°C. This hardware trip point
is configured as critical trip point, to initiate a system shutdown
before the temperature reaches the next hardware trip point at 125°C,
where the PMIC performs a partial shutdown.
The temperature of the critical trip point can be raised after adding
the die temperature ADC as IIO input for spmi-temp-alarm, which
significantly increases the precision of the temperature measurements.
Signed-off-by: Matthias Kaehlcke <m...@chromium.org>
---
Changes in v2:
- defined 'thermal-zones' node in pm8998.dtsi instead of using a label
to refer to it
- use 105°C hardware trip point as critical trip point
- reduced number of trip points to 2
- lowered temperature of passive trip point
- updated trip point names and added labels
- updated commit message
arch/arm64/boot/dts/qcom/pm8998.dtsi | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/arch/arm64/boot/dts/qcom/pm8998.dtsi
b/arch/arm64/boot/dts/qcom/pm8998.dtsi
index 2f4989e7ef68..e7caa334e6c7 100644
--- a/arch/arm64/boot/dts/qcom/pm8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/pm8998.dtsi
@@ -3,6 +3,7 @@
#include <dt-bindings/spmi/spmi.h>
#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/thermal/thermal.h>
&spmi_bus {
pm8998_lsid0: pmic@0 {
@@ -60,3 +61,27 @@
#size-cells = <0>;
};
};
+
+/ {
+ thermal-zones {
+ pm8998 {
+ polling-delay-passive = <250>;
+ polling-delay = <1000>;
+
+ thermal-sensors = <&pm8998_temp>;
+
+ trips {
+ pm8998_alert0: pm8998-alert0 {
+ temperature = <95000>;
+ hysteresis = <2000>;
+ type = "passive";
+ };
+ pm8998_crit: pm8998-crit {
+ temperature = <105000>;
+ hysteresis = <2000>;
+ type = "critical";
+ };
+ };
+ };
+ };
+};
--
2.18.0.399.gad0ab374a1-goog
