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