Documentation/devicetree/bindings/opp/opp-v1.yaml

   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 Bindings
   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 ...