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
7 title: TI CDCE913/925/937/949 programmable I2C clock synthesizers
8
9 maintainers:
10 - Alexander Stein <alexander.stein@ew.tq-group.com>
11
12 description: |
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
20 properties:
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 $ref: /schemas/types.yaml#/definitions/uint32
49 description: |
50 Crystal load-capacitor value to fine-tune performance on a
51 board, or to compensate for external influences.
52
53 patternProperties:
54 "^PLL[1-4]$":
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
75 required:
76 - compatible
77 - reg
78 - clocks
79 - "#clock-cells"
80
81 additionalProperties: false
82
83 examples:
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 = <®_1v8>;
96 vddout-supply = <®_3v3>;
97 /* PLL options to get SSC 1% centered */
98 PLL2 {
99 spread-spectrum = <4>;
100 spread-spectrum-center;
101 };
102 };
103 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.