1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/opp/opp-v1.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Generic OPP (Operating Performance Points) v1
8
9 maintainers:
10 - Viresh Kumar <viresh.kumar@linaro.org>
11
12 description: |+
13 Devices work at voltage-current-frequency combinations and some implementations
14 have the liberty of choosing these. These combinations are called Operating
15 Performance Points aka OPPs. This document defines bindings for these OPPs
16 applicable across wide range of devices. For illustration purpose, this document
17 uses CPU as a device.
18
19 This binding only supports voltage-frequency pairs.
20
21 select: true
22
23 properties:
24 operating-points:
25 $ref: /schemas/types.yaml#/definitions/uint32-matrix
26 items:
27 items:
28 - description: Frequency in kHz
29 - description: Voltage for OPP in uV
30
31
32 additionalProperties: true
33 examples:
34 - |
35 cpus {
36 #address-cells = <1>;
37 #size-cells = <0>;
38
39 cpu@0 {
40 compatible = "arm,cortex-a9";
41 device_type = "cpu";
42 reg = <0>;
43 next-level-cache = <&L2>;
44 operating-points =
45 /* kHz uV */
46 <792000 1100000>,
47 <396000 950000>,
48 <198000 850000>;
49 };
50 };
51 ...
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