xref: /freebsd/sys/contrib/device-tree/Bindings/clock/ti,cdce925.yaml (revision a0ca4af9455b844c5e094fc1b09b1390ffa979fc) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/clock/ti,cdce925.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: TI CDCE913/925/937/949 programmable I2C clock synthesizers
8
9maintainers:
10  - Alexander Stein <alexander.stein@ew.tq-group.com>
11
12description: |
13  Flexible Low Power LVCMOS Clock Generator with SSC Support for EMI Reduction
14
15  - CDCE(L)913: 1-PLL, 3 Outputs https://www.ti.com/product/cdce913
16  - CDCE(L)925: 2-PLL, 5 Outputs https://www.ti.com/product/cdce925
17  - CDCE(L)937: 3-PLL, 7 Outputs https://www.ti.com/product/cdce937
18  - CDCE(L)949: 4-PLL, 9 Outputs https://www.ti.com/product/cdce949
19
20properties:
21  compatible:
22    enum:
23      - ti,cdce913
24      - ti,cdce925
25      - ti,cdce937
26      - ti,cdce949
27
28  reg:
29    maxItems: 1
30
31  clocks:
32    items:
33      - description: fixed parent clock
34
35  "#clock-cells":
36    const: 1
37
38  vdd-supply:
39    description: Regulator that provides 1.8V Vdd power supply
40
41  vddout-supply:
42    description: |
43      Regulator that provides Vddout power supply.
44      non-L variant: 2.5V or 3.3V for
45      L variant: 1.8V for
46
47  xtal-load-pf:
48    $ref: /schemas/types.yaml#/definitions/uint32
49    description: |
50      Crystal load-capacitor value to fine-tune performance on a
51      board, or to compensate for external influences.
52
53patternProperties:
54  "^PLL[1-4]$":
55    type: object
56    description: |
57      optional child node can be used to specify spread
58      spectrum clocking parameters for a board
59
60    additionalProperties: false
61
62    properties:
63      spread-spectrum:
64        $ref: /schemas/types.yaml#/definitions/uint32
65        description: SSC mode as defined in the data sheet
66
67      spread-spectrum-center:
68        type: boolean
69        description: |
70          Use "centered" mode instead of "max" mode. When
71          present, the clock runs at the requested frequency on average.
72          Otherwise the requested frequency is the maximum value of the
73          SCC range.
74
75required:
76  - compatible
77  - reg
78  - clocks
79  - "#clock-cells"
80
81additionalProperties: false
82
83examples:
84  - |
85    i2c {
86        #address-cells = <1>;
87        #size-cells = <0>;
88
89        cdce925: clock-controller@64 {
90            compatible = "ti,cdce925";
91            reg = <0x64>;
92            clocks = <&xtal_27Mhz>;
93            #clock-cells = <1>;
94            xtal-load-pf = <5>;
95            vdd-supply = <&reg_1v8>;
96            vddout-supply = <&reg_3v3>;
97            /* PLL options to get SSC 1% centered */
98            PLL2 {
99                spread-spectrum = <4>;
100                spread-spectrum-center;
101            };
102        };
103    };
104