1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/clock/mediatek,mt8186-fhctl.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: MediaTek frequency hopping and spread spectrum clocking control
8
9 maintainers:
10 - Edward-JW Yang <edward-jw.yang@mediatek.com>
11
12 description: |
13 Frequency hopping control (FHCTL) is a piece of hardware that control
14 some PLLs to adopt "hopping" mechanism to adjust their frequency.
15 Spread spectrum clocking (SSC) is another function provided by this hardware.
16
17 properties:
18 compatible:
19 enum:
20 - mediatek,mt6795-fhctl
21 - mediatek,mt8173-fhctl
22 - mediatek,mt8186-fhctl
23 - mediatek,mt8192-fhctl
24 - mediatek,mt8195-fhctl
25
26 reg:
27 maxItems: 1
28
29 clocks:
30 description: Phandles of the PLL with FHCTL hardware capability.
31 minItems: 1
32 maxItems: 30
33
34 mediatek,hopping-ssc-percent:
35 description: The percentage of spread spectrum clocking for one PLL.
36 minItems: 1
37 maxItems: 30
38 items:
39 default: 0
40 minimum: 0
41 maximum: 8
42
43 required:
44 - compatible
45 - reg
46 - clocks
47
48 additionalProperties: false
49
50 examples:
51 - |
52 #include <dt-bindings/clock/mt8186-clk.h>
53 fhctl: fhctl@1000ce00 {
54 compatible = "mediatek,mt8186-fhctl";
55 reg = <0x1000ce00 0x200>;
56 clocks = <&apmixedsys CLK_APMIXED_MSDCPLL>;
57 mediatek,hopping-ssc-percent = <3>;
58 };
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