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1 # SPDX-License-Identifier: (GPL-2.0)
4 ---
5 $id: http://devicetree.org/schemas/thermal/thermal-zones.yaml#
6 $schema: http://devicetree.org/meta-schemas/base.yaml#
11 - Amit Kucheria <amitk@kernel.org>
18 The following node types are used to completely describe a thermal management
20 - thermal-sensor: device that measures temperature, has SoC-specific bindings
21 - cooling-device: device used to dissipate heat either passively or actively
22 - thermal-zones: a container of the following node types used to describe all
25 This binding describes the thermal-zones.
27 The polling-delay properties of a thermal-zone are bound to the maximum dT/dt
28 (temperature derivative over time) in two situations for a thermal zone:
29 1. when passive cooling is activated (polling-delay-passive)
30 2. when the zone just needs to be monitored (polling-delay) or when
35 max dT/dt, such that a device does not cross several trip boundaries
42 const: thermal-zones
44 A /thermal-zones node is required in order to use the thermal framework to
46 mitigate thermal overload conditions. It does not represent a real device
47 in the system, but acts as a container to link a thermal sensor device,
48 platform-data regarding temperature thresholds and the mitigation actions
52 "^[a-zA-Z][a-zA-Z0-9\\-]{1,12}-thermal$":
57 this zone, one sub-node containing the various trip points for this
58 zone and one sub-node containing all the zone cooling-maps.
61 polling-delay:
69 polling-delay-passive:
78 thermal-sensors:
79 $ref: /schemas/types.yaml#/definitions/phandle-array
86 $ref: /schemas/types.yaml#/definitions/uint32-array
88 An array of integers containing the coefficients of a linear equation
92 z = c0 * x0 + c1 * x1 + ... + c(n-1) * x(n-1) + cn
99 sustainable-power:
104 sustainable power of a 4-inch phone is typically 2000mW, while on a
105 10-inch tablet is around 4500mW.
110 This node describes a set of points in the temperature domain at
112 be taken are defined in another node called cooling-maps.
115 "^[a-zA-Z][a-zA-Z0-9\\-_]{0,63}$":
121 minimum: -273000
133 (trip temperature - hysteresis). This potentially prevents a
140 - active # enable active cooling e.g. fans
141 - passive # enable passive cooling e.g. throttling cpu
142 - hot # send notification to driver
143 - critical # send notification to driver, trigger shutdown
150 unstable and underlying firmware might even trigger a
151 reboot. Hitting the critical threshold triggers a system
154 The hot trip type can be used to send a notification to
155 the thermal driver (if a .notify callback is registered).
159 the CPU, GPU, bus at a lower frequency.
165 - temperature
166 - hysteresis
167 - type
172 cooling-maps:
176 This node describes the action to be taken when a thermal zone
178 node. The action takes the form of a mapping relation between a
182 "^map[-a-zA-Z0-9]*$":
189 A phandle of a trip point node within this thermal zone.
191 cooling-device:
192 $ref: /schemas/types.yaml#/definitions/phandle-array
194 A list of cooling device phandles along with the minimum
196 device. Using the THERMAL_NO_LIMIT (-1UL) constant in the
197 cooling-device phandle limit specifier lets the framework
206 a ratio of the sum of all cooling contributions within a
210 - trip
211 - cooling-device
215 - polling-delay
216 - polling-delay-passive
217 - thermal-sensors
218 - trips
225 - |
226 #include <dt-bindings/interrupt-controller/arm-gic.h>
227 #include <dt-bindings/thermal/thermal.h>
231 #address-cells = <2>;
232 #size-cells = <2>;
236 tsens0: thermal-sensor@c263000 {
237 compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
243 interrupt-names = "uplow", "critical";
244 #thermal-sensor-cells = <1>;
247 tsens1: thermal-sensor@c265000 {
248 compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
254 interrupt-names = "uplow", "critical";
255 #thermal-sensor-cells = <1>;
261 thermal-zones {
262 cpu0-thermal {
263 polling-delay-passive = <250>;
264 polling-delay = <1000>;
266 thermal-sensors = <&tsens0 1>;
269 cpu0_alert0: trip-point0 {
275 cpu0_alert1: trip-point1 {
288 cooling-maps {
292 cooling-device = <&CPU0 3 3>, <&CPU1 3 3>,
299 cooling-device = <&CPU0 5 5>, <&CPU1 5 5>,
307 cluster0-thermal {
308 polling-delay-passive = <250>;
309 polling-delay = <1000>;
311 thermal-sensors = <&tsens0 5>;
314 cluster0_alert0: trip-point0 {
329 gpu-top-thermal {
330 polling-delay-passive = <250>;
331 polling-delay = <1000>;
333 thermal-sensors = <&tsens0 11>;
336 gpu1_alert0: trip-point0 {