summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/clock/samsung,exynosautov9-clock.yaml
blob: eafc715d2d02cb9d083d5709d353ab77a37af056 (plain)
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
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/samsung,exynosautov9-clock.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Samsung Exynos Auto v9 SoC clock controller

maintainers:
  - Chanho Park <chanho61.park@samsung.com>
  - Chanwoo Choi <cw00.choi@samsung.com>
  - Krzysztof Kozlowski <krzk@kernel.org>
  - Sylwester Nawrocki <s.nawrocki@samsung.com>
  - Tomasz Figa <tomasz.figa@gmail.com>

description: |
  Exynos Auto v9 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. Root clocks in that clock tree are
  two external clocks:: OSCCLK/XTCXO (26 MHz) and RTCCLK/XrtcXTI (32768 Hz).
  The external OSCCLK must be defined as fixed-rate clock in dts.

  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,exynosautov9.h' header.

properties:
  compatible:
    enum:
      - samsung,exynosautov9-cmu-top
      - samsung,exynosautov9-cmu-busmc
      - samsung,exynosautov9-cmu-core
      - samsung,exynosautov9-cmu-fsys2
      - samsung,exynosautov9-cmu-peric0
      - samsung,exynosautov9-cmu-peric1
      - samsung,exynosautov9-cmu-peris

  clocks:
    minItems: 1
    maxItems: 5

  clock-names:
    minItems: 1
    maxItems: 5

  "#clock-cells":
    const: 1

  reg:
    maxItems: 1

allOf:
  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynosautov9-cmu-top

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)

        clock-names:
          items:
            - const: oscclk

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynosautov9-cmu-busmc

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_BUSMC bus clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_clkcmu_busmc_bus

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynosautov9-cmu-core

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_CORE bus clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_clkcmu_core_bus

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynosautov9-cmu-fsys2

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_FSYS2 bus clock (from CMU_TOP)
            - description: UFS clock (from CMU_TOP)
            - description: Ethernet clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_clkcmu_fsys2_bus
            - const: dout_fsys2_clkcmu_ufs_embd
            - const: dout_fsys2_clkcmu_ethernet

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynosautov9-cmu-peric0

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_PERIC0 bus clock (from CMU_TOP)
            - description: PERIC0 IP clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_clkcmu_peric0_bus
            - const: dout_clkcmu_peric0_ip

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynosautov9-cmu-peric1

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_PERIC1 bus clock (from CMU_TOP)
            - description: PERIC1 IP clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_clkcmu_peric1_bus
            - const: dout_clkcmu_peric1_ip

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynosautov9-cmu-peris

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_PERIS bus clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_clkcmu_peris_bus

required:
  - compatible
  - "#clock-cells"
  - clocks
  - clock-names
  - reg

additionalProperties: false

examples:
  # Clock controller node for CMU_FSYS2
  - |
    #include <dt-bindings/clock/samsung,exynosautov9.h>

    cmu_fsys2: clock-controller@17c00000 {
        compatible = "samsung,exynosautov9-cmu-fsys2";
        reg = <0x17c00000 0x8000>;
        #clock-cells = <1>;

        clocks = <&xtcxo>,
                 <&cmu_top DOUT_CLKCMU_FSYS2_BUS>,
                 <&cmu_top DOUT_CLKCMU_FSYS2_UFS_EMBD>,
                 <&cmu_top DOUT_CLKCMU_FSYS2_ETHERNET>;
        clock-names = "oscclk",
                      "dout_clkcmu_fsys2_bus",
                      "dout_fsys2_clkcmu_ufs_embd",
                      "dout_fsys2_clkcmu_ethernet";
    };

...