xref: /linux/Documentation/devicetree/bindings/opp/opp-v1.yaml (revision e3b2949e3fa2fd8c19cd5fbb0424d38f70a70e9c) 
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
7title: Generic OPP (Operating Performance Points) v1
8
9maintainers:
10  - Viresh Kumar <viresh.kumar@linaro.org>
11
12description: |+
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
21select: true
22
23properties:
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
32additionalProperties: true
33examples:
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...
52