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dt-bindings: thermal: qcom-spmi-temp-alarm: Improve thermal zone in example 

The current example for a thermal zone isn't very useful as reference
since it would result in a hardware shutdown at 145°C, instead of
allowing the system to try to shutdown gracefully. Without an ADC
channel a maximum of two trip points is useful in practice for this
sensor, with temperatures corresponding to the stage 1 and stage 2
'hardware trip points'. A critical trip point at stage 2 may allow the
system to shutdown before a hardware shutdown at stage 3 kicks in. It
should be noted though that by default the chip performs a 'partial
shutdown' when the temperature reaches stage 2, which may prevent an
orderly shutdown. The 'partial shutdown' can be disabled by software.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Matthias Kaehlcke 2018-07-31 11:59:14 -07:00 committed by Eduardo Valentin
parent 7fd5257f11
commit 97b27dd33d
1 changed files with 3 additions and 8 deletions
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11
Documentation/devicetree/bindings/thermal/qcom-spmi-temp-alarm.txt
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@ -35,19 +35,14 @@ Example:
thermal-sensors = <&pm8941_temp>;
trips {
passive {
temperature = <1050000>;
stage1 {
temperature = <105000>;
hysteresis = <2000>;
type = "passive";
};
alert {
stage2 {
temperature = <125000>;
hysteresis = <2000>;
type = "hot";
};
crit {
temperature = <145000>;
hysteresis = <2000>;
type = "critical";
};
};