Lines Matching +full:cooling +full:- +full:levels

1 # SPDX-License-Identifier: (GPL-2.0)
4 ---
5 $id: http://devicetree.org/schemas/thermal/thermal-cooling-devices.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: Thermal cooling device
11   - Amit Kucheria <amitk@kernel.org>
15   and the software abstraction of cooling devices and thermal zones required to
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 cooling devices.
28     - Passive cooling: by means of regulating device performance. A typical
29       passive cooling mechanism is a CPU that has dynamic voltage and frequency
30       scaling (DVFS), and uses lower frequencies as cooling states.
31     - Active cooling: by means of activating devices in order to remove the
34   Any cooling device has a range of cooling states (i.e. different levels of
35   heat dissipation). They also have a way to determine the state of cooling in
36   which the device is. For example, a fan's cooling states correspond to the
37   different fan speeds possible. Cooling states are referred to by single
39   precise set of cooling states associated with a device should be defined in
45   "#cooling-cells":
47       Must be 2, in order to specify minimum and maximum cooling state used in
48       the cooling-maps reference. The first cell is the minimum cooling state
49       and the second cell is the maximum cooling state requested.
55   - |
56     #include <dt-bindings/interrupt-controller/arm-gic.h>
57     #include <dt-bindings/thermal/thermal.h>
59     // Example 1: Cpufreq cooling device on CPU0
61             #address-cells = <2>;
62             #size-cells = <0>;
68                     enable-method = "psci";
69                     cpu-idle-states = <&LITTLE_CPU_SLEEP_0>,
72                     capacity-dmips-mhz = <607>;
73                     dynamic-power-coefficient = <100>;
74                     qcom,freq-domain = <&cpufreq_hw 0>;
75                     #cooling-cells = <2>;
76                     next-level-cache = <&L2_0>;
77                     L2_0: l2-cache {
79                             cache-unified;
80                             cache-level = <2>;
81                             next-level-cache = <&L3_0>;
82                             L3_0: l3-cache {
84                                     cache-unified;
85                                     cache-level = <3>;
96     thermal-zones {
97             cpu0-thermal {
98                     polling-delay-passive = <250>;
99                     polling-delay = <1000>;
101                     thermal-sensors = <&tsens0 1>;
104                             cpu0_alert0: trip-point0 {
111                     cooling-maps {
115                                     cooling-device = <&CPU0 5 5>;