1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/clock/google,gs101-clock.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Google GS101 SoC clock controller
8
9 maintainers:
10 - Peter Griffin <peter.griffin@linaro.org>
11
12 description: |
13 Google GS101 clock controller is comprised of several CMU units, generating
14 clocks for different domains. Those CMU units are modeled as separate device
15 tree nodes, and might depend on each other. The root clock in that clock tree
16 is OSCCLK (24.576 MHz). That external clock must be defined as a fixed-rate
17 clock in dts.
18
19 CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
20 dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP.
21
22 Each clock is assigned an identifier and client nodes can use this identifier
23 to specify the clock which they consume. All clocks available for usage
24 in clock consumer nodes are defined as preprocessor macros in
25 'dt-bindings/clock/gs101.h' header.
26
27 properties:
28 compatible:
29 enum:
30 - google,gs101-cmu-top
31 - google,gs101-cmu-apm
32 - google,gs101-cmu-misc
33 - google,gs101-cmu-hsi0
34 - google,gs101-cmu-hsi2
35 - google,gs101-cmu-peric0
36 - google,gs101-cmu-peric1
37
38 clocks:
39 minItems: 1
40 maxItems: 5
41
42 clock-names:
43 minItems: 1
44 maxItems: 5
45
46 "#clock-cells":
47 const: 1
48
49 reg:
50 maxItems: 1
51
52 required:
53 - compatible
54 - "#clock-cells"
55 - clocks
56 - clock-names
57 - reg
58
59 allOf:
60 - if:
61 properties:
62 compatible:
63 contains:
64 enum:
65 - google,gs101-cmu-top
66 - google,gs101-cmu-apm
67 then:
68 properties:
69 clocks:
70 items:
71 - description: External reference clock (24.576 MHz)
72
73 clock-names:
74 items:
75 - const: oscclk
76
77 - if:
78 properties:
79 compatible:
80 contains:
81 const: google,gs101-cmu-hsi0
82
83 then:
84 properties:
85 clocks:
86 items:
87 - description: External reference clock (24.576 MHz)
88 - description: HSI0 bus clock (from CMU_TOP)
89 - description: DPGTC (from CMU_TOP)
90 - description: USB DRD controller clock (from CMU_TOP)
91 - description: USB Display Port debug clock (from CMU_TOP)
92
93 clock-names:
94 items:
95 - const: oscclk
96 - const: bus
97 - const: dpgtc
98 - const: usb31drd
99 - const: usbdpdbg
100
101 - if:
102 properties:
103 compatible:
104 contains:
105 enum:
106 - google,gs101-cmu-hsi2
107
108 then:
109 properties:
110 clocks:
111 items:
112 - description: External reference clock (24.576 MHz)
113 - description: High Speed Interface bus clock (from CMU_TOP)
114 - description: High Speed Interface pcie clock (from CMU_TOP)
115 - description: High Speed Interface ufs clock (from CMU_TOP)
116 - description: High Speed Interface mmc clock (from CMU_TOP)
117
118 clock-names:
119 items:
120 - const: oscclk
121 - const: bus
122 - const: pcie
123 - const: ufs
124 - const: mmc
125
126 - if:
127 properties:
128 compatible:
129 contains:
130 const: google,gs101-cmu-misc
131
132 then:
133 properties:
134 clocks:
135 items:
136 - description: Misc bus clock (from CMU_TOP)
137 - description: Misc sss clock (from CMU_TOP)
138
139 clock-names:
140 items:
141 - const: bus
142 - const: sss
143
144 - if:
145 properties:
146 compatible:
147 contains:
148 enum:
149 - google,gs101-cmu-peric0
150 - google,gs101-cmu-peric1
151
152 then:
153 properties:
154 clocks:
155 items:
156 - description: External reference clock (24.576 MHz)
157 - description: Connectivity Peripheral 0/1 bus clock (from CMU_TOP)
158 - description: Connectivity Peripheral 0/1 IP clock (from CMU_TOP)
159
160 clock-names:
161 items:
162 - const: oscclk
163 - const: bus
164 - const: ip
165
166 additionalProperties: false
167
168 examples:
169 # Clock controller node for CMU_TOP
170 - |
171 #include <dt-bindings/clock/google,gs101.h>
172
173 cmu_top: clock-controller@1e080000 {
174 compatible = "google,gs101-cmu-top";
175 reg = <0x1e080000 0x8000>;
176 #clock-cells = <1>;
177 clocks = <&ext_24_5m>;
178 clock-names = "oscclk";
179 };
180
181 ...
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.