1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/samsung,exynos2200-cmu.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Samsung Exynos2200 SoC clock controller
maintainers:
- Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
- Chanwoo Choi <cw00.choi@samsung.com>
- Krzysztof Kozlowski <krzk@kernel.org>
description: |
Exynos2200 clock controller is comprised of several CMU units, generating
clocks for different domains. Those CMU units are modeled as separate device
tree nodes, and might depend on each other. The root clocks in that root tree
are two external clocks: XTCXO (76.8 MHz) and RTCCLK (32768 Hz). XTCXO must be
defined as a fixed-rate clock in dts, whereas RTCCLK originates from PMIC.
CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
dividers; all other clocks of function blocks (other CMUs) are usually
derived from CMU_TOP.
Each clock is assigned an identifier and client nodes can use this identifier
to specify the clock which they consume. All clocks available for usage
in clock consumer nodes are defined as preprocessor macros in
'include/dt-bindings/clock/samsung,exynos2200-cmu.h' header.
properties:
compatible:
enum:
- samsung,exynos2200-cmu-alive
- samsung,exynos2200-cmu-cmgp
- samsung,exynos2200-cmu-hsi0
- samsung,exynos2200-cmu-peric0
- samsung,exynos2200-cmu-peric1
- samsung,exynos2200-cmu-peric2
- samsung,exynos2200-cmu-peris
- samsung,exynos2200-cmu-top
- samsung,exynos2200-cmu-ufs
- samsung,exynos2200-cmu-vts
clocks:
minItems: 1
maxItems: 6
clock-names:
minItems: 1
maxItems: 6
"#clock-cells":
const: 1
reg:
maxItems: 1
required:
- compatible
- clocks
- clock-names
- reg
- "#clock-cells"
allOf:
- if:
properties:
compatible:
contains:
const: samsung,exynos2200-cmu-alive
then:
properties:
clocks:
items:
- description: External reference clock (76.8 MHz)
- description: CMU_ALIVE NOC clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: noc
- if:
properties:
compatible:
contains:
const: samsung,exynos2200-cmu-cmgp
then:
properties:
clocks:
items:
- description: External reference clock (76.8 MHz)
- description: CMU_CMGP NOC clock (from CMU_TOP)
- description: CMU_CMGP PERI clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: noc
- const: peri
- if:
properties:
compatible:
contains:
const: samsung,exynos2200-cmu-hsi0
then:
properties:
clocks:
items:
- description: External reference clock (76.8 MHz)
- description: External RTC clock (32768 Hz)
- description: CMU_HSI0 NOC clock (from CMU_TOP)
- description: CMU_HSI0 DPGTC clock (from CMU_TOP)
- description: CMU_HSI0 DPOSC clock (from CMU_TOP)
- description: CMU_HSI0 USB32DRD clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: rtcclk
- const: noc
- const: dpgtc
- const: dposc
- const: usb
- if:
properties:
compatible:
contains:
enum:
- samsung,exynos2200-cmu-peric0
- samsung,exynos2200-cmu-peric1
- samsung,exynos2200-cmu-peric2
then:
properties:
clocks:
items:
- description: External reference clock (76.8 MHz)
- description: CMU_PERICn NOC clock (from CMU_TOP)
- description: CMU_PERICn IP0 clock (from CMU_TOP)
- description: CMU_PERICn IP1 clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: noc
- const: ip0
- const: ip1
- if:
properties:
compatible:
contains:
const: samsung,exynos2200-cmu-peris
then:
properties:
clocks:
items:
- description: External reference clock (25.6 MHz)
- description: CMU_PERIS NOC clock (from CMU_TOP)
- description: CMU_PERIS GIC clock (from CMU_TOP)
clock-names:
items:
- const: tcxo_div3
- const: noc
- const: gic
- if:
properties:
compatible:
contains:
const: samsung,exynos2200-cmu-top
then:
properties:
clocks:
items:
- description: External reference clock (76.8 MHz)
clock-names:
items:
- const: oscclk
- if:
properties:
compatible:
contains:
const: samsung,exynos2200-cmu-ufs
then:
properties:
clocks:
items:
- description: External reference clock (76.8 MHz)
- description: CMU_UFS NOC clock (from CMU_TOP)
- description: CMU_UFS MMC clock (from CMU_TOP)
- description: CMU_UFS UFS clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: noc
- const: mmc
- const: ufs
- if:
properties:
compatible:
contains:
const: samsung,exynos2200-cmu-vts
then:
properties:
clocks:
items:
- description: External reference clock (76.8 MHz)
- description: CMU_VTS DMIC clock (from CMU_TOP)
clock-names:
items:
- const: oscclk
- const: dmic
additionalProperties: false
examples:
- |
#include <dt-bindings/clock/samsung,exynos2200-cmu.h>
cmu_vts: clock-controller@15300000 {
compatible = "samsung,exynos2200-cmu-vts";
reg = <0x15300000 0x8000>;
#clock-cells = <1>;
clocks = <&oscclk>,
<&cmu_top CLK_DOUT_CMU_VTS_DMIC>;
clock-names = "oscclk", "dmic";
};
...