1 # SPDX-License-Identifier: (GPL-2.0-only OR BS
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/clock/arm,s
5 $schema: http://devicetree.org/meta-schemas/co
6
7 title: ARM System Controller ICST Clocks
8
9 maintainers:
10 - Linus Walleij <linusw@kernel.org>
11
12 description: |
13 The ICS525 and ICS307 oscillators are produc
14 Devices Technology (IDT). ARM integrated the
15 reference designs by adding special control
16 oscillators to their system controllers.
17
18 The various ARM system controllers contain l
19 an ICST clock request after a write to the 3
20 into the system controller. Furthermore, to
21 these frequencies, the system controller mus
22 writing a special token to another offset in
23
24 Some ARM hardware contain special versions o
25 connects the low 8 bits of the VDW (missing
26 different values and sometimes also hard-wir
27 therefore have special compatible strings as
28 the value on the pins, not the resulting out
29
30 In the core modules and logic tiles, the ICS
31 from a 24 MHz clock on the motherboard (usua
32 generating e.g. video clocks. It is located
33 only one of these. This clock node must be a
34
35 Hardware variant RDW OD
36
37 Integrator/AP 22 1
38 integratorap-cm
39
40 Integrator/AP 46 3
41 integratorap-sys
42
43 Integrator/AP 22 or 1
44 integratorap-pci 14 1
45
46 Integrator/CP 22 variable
47 integratorcp-cm-core
48
49 Integrator/CP 22 variable
50 integratorcp-cm-mem
51
52 The ICST oscillator must be provided inside
53
54 properties:
55 "#clock-cells":
56 const: 0
57
58 compatible:
59 enum:
60 - arm,syscon-icst525
61 - arm,syscon-icst307
62 - arm,syscon-icst525-integratorap-cm
63 - arm,syscon-icst525-integratorap-sys
64 - arm,syscon-icst525-integratorap-pci
65 - arm,syscon-icst525-integratorcp-cm-cor
66 - arm,syscon-icst525-integratorcp-cm-mem
67 - arm,integrator-cm-auxosc
68 - arm,versatile-cm-auxosc
69 - arm,impd1-vco1
70 - arm,impd1-vco2
71
72 reg:
73 maxItems: 1
74 description: The VCO register
75
76 clocks:
77 description: Parent clock for the ICST VCO
78 maxItems: 1
79
80 clock-output-names:
81 maxItems: 1
82
83 lock-offset:
84 $ref: /schemas/types.yaml#/definitions/uin
85 description: Offset to the unlocking regis
86
87 vco-offset:
88 $ref: /schemas/types.yaml#/definitions/uin
89 description: Offset to the VCO register fo
90 deprecated: true
91
92 required:
93 - "#clock-cells"
94 - compatible
95 - clocks
96
97 additionalProperties: false
98
99 examples:
100 - |
101 vco1: clock {
102 compatible = "arm,impd1-vco1";
103 #clock-cells = <0>;
104 lock-offset = <0x08>;
105 vco-offset = <0x00>;
106 clocks = <&sysclk>;
107 clock-output-names = "IM-PD1-VCO1";
108 };
109
110 ...
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