Lines Matching +full:- +full:thermal
1 # SPDX-License-Identifier: (GPL-2.0)
4 ---
5 $id: http://devicetree.org/schemas/thermal/thermal-zones.yaml#
6 $schema: http://devicetree.org/meta-schemas/base.yaml#
8 title: Thermal zone
11 - Daniel Lezcano <daniel.lezcano@linaro.org>
14 Thermal management is achieved in devicetree by describing the sensor hardware
15 and the software abstraction of cooling devices and thermal zones required to
16 take appropriate action to mitigate thermal overloads.
18 The following node types are used to completely describe a thermal management
20 - thermal-sensor: device that measures temperature, has SoC-specific bindings
21 - cooling-device: device used to dissipate heat either passively or actively
22 - thermal-zones: a container of the following node types used to describe all
23 thermal data for the platform
25 This binding describes the thermal-zones.
27 The polling-delay properties of a thermal-zone are bound to the maximum dT/dt
28 (temperature derivative over time) in two situations for a thermal zone:
29 1. when passive cooling is activated (polling-delay-passive)
30 2. when the zone just needs to be monitored (polling-delay) or when
42 const: thermal-zones
44 A /thermal-zones node is required in order to use the thermal framework to
45 manage input from the various thermal zones in the system in order to
46 mitigate thermal overload conditions. It does not represent a real device
47 in the system, but acts as a container to link a thermal sensor device,
48 platform-data regarding temperature thresholds and the mitigation actions
52 # Node name is limited in size due to Linux kernel requirements - 19
55 "^[a-zA-Z][a-zA-Z0-9\\-]{1,10}-thermal$":
58 Each thermal zone node contains information about how frequently it
60 this zone, one sub-node containing the various trip points for this
61 zone and one sub-node containing all the zone cooling-maps.
64 polling-delay:
68 checking this thermal zone. Setting this to 0 disables the polling
69 timers setup by the thermal framework and assumes that the thermal
72 polling-delay-passive:
76 checking this thermal zone while doing passive cooling. Setting
77 this to 0 disables the polling timers setup by the thermal
78 framework and assumes that the thermal sensors in this zone
81 critical-action:
88 Choose 'reboot' with care, as the hardware may be in thermal stress,
91 over the thermal control.
94 - shutdown
95 - reboot
97 thermal-sensors:
98 $ref: /schemas/types.yaml#/definitions/phandle-array
101 The thermal sensor phandle and sensor specifier used to monitor this
102 thermal zone.
105 $ref: /schemas/types.yaml#/definitions/uint32-array
108 that binds all the sensors listed in this thermal zone.
111 z = c0 * x0 + c1 * x1 + ... + c(n-1) * x(n-1) + cn
118 sustainable-power:
121 An estimate of the sustainable power (in mW) that this thermal zone
123 sustainable power of a 4-inch phone is typically 2000mW, while on a
124 10-inch tablet is around 4500mW.
130 which the thermal framework needs to take action. The actions to
131 be taken are defined in another node called cooling-maps.
134 "^[a-zA-Z][a-zA-Z0-9\\-_]{0,63}$":
140 minimum: -273000
152 (trip temperature - hysteresis). This potentially prevents a
159 - active # enable active cooling e.g. fans
160 - passive # enable passive cooling e.g. throttling cpu
161 - hot # send notification to driver
162 - critical # send notification to driver, trigger shutdown
174 the thermal driver (if a .notify callback is registered).
184 - temperature
185 - hysteresis
186 - type
191 cooling-maps:
195 This node describes the action to be taken when a thermal zone
201 "^map[-a-zA-Z0-9]*$":
208 A phandle of a trip point node within this thermal zone.
210 cooling-device:
211 $ref: /schemas/types.yaml#/definitions/phandle-array
215 device. Using the THERMAL_NO_LIMIT (-1UL) constant in the
216 cooling-device phandle limit specifier lets the framework
223 The cooling contribution to the thermal zone of the referred
226 thermal zone.
229 - trip
230 - cooling-device
234 - thermal-sensors
241 - |
242 #include <dt-bindings/interrupt-controller/arm-gic.h>
243 #include <dt-bindings/thermal/thermal.h>
247 #address-cells = <2>;
248 #size-cells = <2>;
252 tsens0: thermal-sensor@c263000 {
253 compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
259 interrupt-names = "uplow", "critical";
260 #thermal-sensor-cells = <1>;
263 tsens1: thermal-sensor@c265000 {
264 compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
270 interrupt-names = "uplow", "critical";
271 #thermal-sensor-cells = <1>;
277 thermal-zones {
278 cpu0-thermal {
279 polling-delay-passive = <250>;
280 polling-delay = <1000>;
282 thermal-sensors = <&tsens0 1>;
285 cpu0_alert0: trip-point0 {
291 cpu0_alert1: trip-point1 {
304 cooling-maps {
308 cooling-device = <&CPU0 3 3>, <&CPU1 3 3>,
315 cooling-device = <&CPU0 5 5>, <&CPU1 5 5>,
323 cluster0-thermal {
324 polling-delay-passive = <250>;
325 polling-delay = <1000>;
327 thermal-sensors = <&tsens0 5>;
330 cluster0_alert0: trip-point0 {
345 gpu-top-thermal {
346 polling-delay-passive = <250>;
347 polling-delay = <1000>;
349 thermal-sensors = <&tsens0 11>;
352 gpu1_alert0: trip-point0 {