summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/clock/samsung,exynos7885-clock.yaml
blob: 006d33a9e0f10f7a789b3bbbc5673eb2c647c6d9 (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
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/clock/samsung,exynos7885-clock.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Samsung Exynos7885 SoC clock controller

maintainers:
  - Dávid Virág <virag.david003@gmail.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: |
  Exynos7885 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 clock in that root tree
  is an external clock: OSCCLK (26 MHz). This external clock must be defined
  as a fixed-rate clock in dts.

  CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
  dividers; all other leaf clocks (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
  'dt-bindings/clock/exynos7885.h' header.

properties:
  compatible:
    enum:
      - samsung,exynos7885-cmu-top
      - samsung,exynos7885-cmu-core
      - samsung,exynos7885-cmu-fsys
      - samsung,exynos7885-cmu-peri

  clocks:
    minItems: 1
    maxItems: 10

  clock-names:
    minItems: 1
    maxItems: 10

  "#clock-cells":
    const: 1

  reg:
    maxItems: 1

allOf:
  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynos7885-cmu-top

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

        clock-names:
          items:
            - const: oscclk

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynos7885-cmu-core

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_CORE bus clock (from CMU_TOP)
            - description: CCI clock (from CMU_TOP)
            - description: G3D clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_core_bus
            - const: dout_core_cci
            - const: dout_core_g3d

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynos7885-cmu-fsys

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_FSYS bus clock (from CMU_TOP)
            - description: MMC_CARD clock (from CMU_TOP)
            - description: MMC_EMBD clock (from CMU_TOP)
            - description: MMC_SDIO clock (from CMU_TOP)
            - description: USB30DRD clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_fsys_bus
            - const: dout_fsys_mmc_card
            - const: dout_fsys_mmc_embd
            - const: dout_fsys_mmc_sdio
            - const: dout_fsys_usb30drd

  - if:
      properties:
        compatible:
          contains:
            const: samsung,exynos7885-cmu-peri

    then:
      properties:
        clocks:
          items:
            - description: External reference clock (26 MHz)
            - description: CMU_PERI bus clock (from CMU_TOP)
            - description: SPI0 clock (from CMU_TOP)
            - description: SPI1 clock (from CMU_TOP)
            - description: UART0 clock (from CMU_TOP)
            - description: UART1 clock (from CMU_TOP)
            - description: UART2 clock (from CMU_TOP)
            - description: USI0 clock (from CMU_TOP)
            - description: USI1 clock (from CMU_TOP)
            - description: USI2 clock (from CMU_TOP)

        clock-names:
          items:
            - const: oscclk
            - const: dout_peri_bus
            - const: dout_peri_spi0
            - const: dout_peri_spi1
            - const: dout_peri_uart0
            - const: dout_peri_uart1
            - const: dout_peri_uart2
            - const: dout_peri_usi0
            - const: dout_peri_usi1
            - const: dout_peri_usi2

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

additionalProperties: false

examples:
  # Clock controller node for CMU_PERI
  - |
    #include <dt-bindings/clock/exynos7885.h>

    cmu_peri: clock-controller@10010000 {
        compatible = "samsung,exynos7885-cmu-peri";
        reg = <0x10010000 0x8000>;
        #clock-cells = <1>;

        clocks = <&oscclk>,
                 <&cmu_top CLK_DOUT_PERI_BUS>,
                 <&cmu_top CLK_DOUT_PERI_SPI0>,
                 <&cmu_top CLK_DOUT_PERI_SPI1>,
                 <&cmu_top CLK_DOUT_PERI_UART0>,
                 <&cmu_top CLK_DOUT_PERI_UART1>,
                 <&cmu_top CLK_DOUT_PERI_UART2>,
                 <&cmu_top CLK_DOUT_PERI_USI0>,
                 <&cmu_top CLK_DOUT_PERI_USI1>,
                 <&cmu_top CLK_DOUT_PERI_USI2>;
        clock-names = "oscclk",
                      "dout_peri_bus",
                      "dout_peri_spi0",
                      "dout_peri_spi1",
                      "dout_peri_uart0",
                      "dout_peri_uart1",
                      "dout_peri_uart2",
                      "dout_peri_usi0",
                      "dout_peri_usi1",
                      "dout_peri_usi2";
    };

...