xref: /freebsd-src/sys/contrib/device-tree/Bindings/clock/fixed-mmio-clock.yaml (revision 8bab661a3316d8bd9b9fbd11a3b4371b91507bd2)

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/fixed-mmio-clock.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Simple memory mapped IO fixed-rate clock sources

description:
  This binding describes a fixed-rate clock for which the frequency can
  be read from a single 32-bit memory mapped I/O register.

  It was designed for test systems, like FPGA, not for complete,
  finished SoCs.

maintainers:
  - Jan Kotas <jank@cadence.com>

properties:
  compatible:
    const: fixed-mmio-clock

  reg:
    maxItems: 1

  "#clock-cells":
    const: 0

  clock-output-names:
    maxItems: 1

required:
  - compatible
  - reg
  - "#clock-cells"

additionalProperties: false

examples:
  - |
    sysclock: sysclock@fd020004 {
      compatible = "fixed-mmio-clock";
      #clock-cells = <0>;
      reg = <0xfd020004 0x4>;
      clock-output-names = "sysclk";
    };
...