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Message-Id: <20180709212522.187257-2-mka@chromium.org>
Date: Mon, 9 Jul 2018 14:25:22 -0700
From: Matthias Kaehlcke <mka@...omium.org>
To: Andy Gross <andy.gross@...aro.org>,
David Brown <david.brown@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>
Cc: linux-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
David Collins <collinsd@...eaurora.org>,
Douglas Anderson <dianders@...omium.org>,
Stephen Boyd <sboyd@...nel.org>,
Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v3 2/2] arm64: dts: qcom: pm8998: Add pm8998 thermal zone
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 increased 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 <mka@...omium.org>
---
Changes in v3:
- moved 'thermal-zones' node to the beginning of the .dtsi
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 7eea94701b23..52c5e797aab2 100644
--- a/arch/arm64/boot/dts/qcom/pm8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/pm8998.dtsi
@@ -3,6 +3,31 @@
#include <dt-bindings/spmi/spmi.h>
#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/thermal/thermal.h>
+
+/ {
+ 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";
+ };
+ };
+ };
+ };
+};
&spmi_bus {
pm8998_lsid0: pmic@0 {
--
2.18.0.203.gfac676dfb9-goog
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