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[v2,01/12] of: Add bindings of thermtrip for Tegra soctherm

Message ID 1550744327-4677-2-git-send-email-wni@nvidia.com (mailing list archive)
State Accepted
Delegated to: Eduardo Valentin
Headers show
Series Add some functionalities for Tegra soctherm | expand

Commit Message

Wei Ni Feb. 21, 2019, 10:18 a.m. UTC
Add optional property "nvidia,thermtrips".
If present, these trips will be used as HW shutdown trips,
and critical trips will be used as SW shutdown trips.

Signed-off-by: Wei Ni <wni@nvidia.com>
 .../bindings/thermal/nvidia,tegra124-soctherm.txt    | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)
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diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
index b6c0ae53d4dc..ab66d6feab4b 100644
--- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
+++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
@@ -55,10 +55,21 @@  Required properties :
       - #cooling-cells: Should be 1. This cooling device only support on/off state.
         See ./thermal.txt for a description of this property.
+Optional properties:
+- nvidia,thermtrips : When present, this property specifies the temperature at
+  which the soctherm hardware will assert the thermal trigger signal to the
+  Power Management IC, which can be configured to reset or shutdown the device.
+  It is an array of pairs where each pair represents a tsensor id followed by a
+  temperature in milli Celcius. In the absence of this property the critical
+  trip point will be used for thermtrip temperature.
-- the "critical" type trip points will be set to SOC_THERM hardware as the
-shut down temperature. Once the temperature of this thermal zone is higher
-than it, the system will be shutdown or reset by hardware.
+- the "critical" type trip points will be used to set the temperature at which
+the SOC_THERM hardware will assert a thermal trigger if the "nvidia,thermtrips"
+property is missing. When the thermtrips property is present, the breach of a
+critical trip point is reported back to the thermal framework to implement
+software shutdown.
 - the "hot" type trip points will be set to SOC_THERM hardware as the throttle
 temperature. Once the the temperature of this thermal zone is higher
 than it, it will trigger the HW throttle event.
@@ -79,6 +90,9 @@  Example :
 		#thermal-sensor-cells = <1>;
+		nvidia,thermtrips = <TEGRA124_SOCTHERM_SENSOR_CPU 102500
+				     TEGRA124_SOCTHERM_SENSOR_GPU 103000>;
 		throttle-cfgs {
 			 * When the "heavy" cooling device triggered,