bindings/thermal/thermal-cooling-devices.yaml

5 $id: http://devicetree.org/schemas/thermal/thermal-cooling-devices.yaml#
8 title: Thermal cooling device
15   and the software abstraction of cooling devices and thermal zones required to
21    - cooling-device: device used to dissipate heat either passively or actively
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
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.
59     // Example 1: Cpufreq cooling device on CPU0
75                     #cooling-cells = <2>;
111                     cooling-maps {
115                                     cooling-device = <&CPU0 5 5>;