xref: /openbmc/linux/Documentation/devicetree/bindings/clock/mediatek,mt8186-fhctl.yaml (revision 4ba8590f)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/mediatek,mt8186-fhctl.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: MediaTek frequency hopping and spread spectrum clocking control

maintainers:
  - Edward-JW Yang <edward-jw.yang@mediatek.com>

description: |
  Frequency hopping control (FHCTL) is a piece of hardware that control
  some PLLs to adopt "hopping" mechanism to adjust their frequency.
  Spread spectrum clocking (SSC) is another function provided by this hardware.

properties:
  compatible:
    enum:
      - mediatek,mt6795-fhctl
      - mediatek,mt8173-fhctl
      - mediatek,mt8186-fhctl
      - mediatek,mt8192-fhctl
      - mediatek,mt8195-fhctl

  reg:
    maxItems: 1

  clocks:
    description: Phandles of the PLL with FHCTL hardware capability.
    minItems: 1
    maxItems: 30

  mediatek,hopping-ssc-percent:
    description: The percentage of spread spectrum clocking for one PLL.
    minItems: 1
    maxItems: 30
    items:
      default: 0
      minimum: 0
      maximum: 8

required:
  - compatible
  - reg
  - clocks

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/mt8186-clk.h>
    fhctl: fhctl@1000ce00 {
        compatible = "mediatek,mt8186-fhctl";
        reg = <0x1000ce00 0x200>;
        clocks = <&apmixedsys CLK_APMIXED_MSDCPLL>;
        mediatek,hopping-ssc-percent = <3>;
    };