xref: /openbmc/linux/Documentation/devicetree/bindings/opp/opp-v1.yaml (revision 84e85359)

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/opp/opp-v1.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Generic OPP (Operating Performance Points) v1

maintainers:
  - Viresh Kumar <viresh.kumar@linaro.org>

description: |+
  Devices work at voltage-current-frequency combinations and some implementations
  have the liberty of choosing these. These combinations are called Operating
  Performance Points aka OPPs. This document defines bindings for these OPPs
  applicable across wide range of devices. For illustration purpose, this document
  uses CPU as a device.

  This binding only supports voltage-frequency pairs.

select: true

properties:
  operating-points:
    $ref: /schemas/types.yaml#/definitions/uint32-matrix
    items:
      items:
        - description: Frequency in kHz
        - description: Voltage for OPP in uV


additionalProperties: true
examples:
  - |
    cpus {
        #address-cells = <1>;
        #size-cells = <0>;

        cpu@0 {
            compatible = "arm,cortex-a9";
            device_type = "cpu";
            reg = <0>;
            next-level-cache = <&L2>;
            operating-points =
                /* kHz    uV */
                <792000 1100000>,
                <396000 950000>,
                <198000 850000>;
        };
    };
...