xref: /freebsd/sys/contrib/device-tree/Bindings/clock/samsung,exynos850-clock.yaml (revision b077aed33b7b6aefca7b17ddb250cf521f938613) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/clock/samsung,exynos850-clock.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: Samsung Exynos850 SoC clock controller
8
9maintainers:
10  - Sam Protsenko <semen.protsenko@linaro.org>
11  - Chanwoo Choi <cw00.choi@samsung.com>
12  - Krzysztof Kozlowski <krzk@kernel.org>
13  - Sylwester Nawrocki <s.nawrocki@samsung.com>
14  - Tomasz Figa <tomasz.figa@gmail.com>
15
16description: |
17  Exynos850 clock controller is comprised of several CMU units, generating
18  clocks for different domains. Those CMU units are modeled as separate device
19  tree nodes, and might depend on each other. Root clocks in that clock tree are
20  two external clocks:: OSCCLK (26 MHz) and RTCCLK (32768 Hz). Those external
21  clocks must be defined as fixed-rate clocks in dts.
22
23  CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and
24  dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP.
25
26  Each clock is assigned an identifier and client nodes can use this identifier
27  to specify the clock which they consume. All clocks available for usage
28  in clock consumer nodes are defined as preprocessor macros in
29  'dt-bindings/clock/exynos850.h' header.
30
31properties:
32  compatible:
33    enum:
34      - samsung,exynos850-cmu-top
35      - samsung,exynos850-cmu-apm
36      - samsung,exynos850-cmu-cmgp
37      - samsung,exynos850-cmu-core
38      - samsung,exynos850-cmu-dpu
39      - samsung,exynos850-cmu-hsi
40      - samsung,exynos850-cmu-peri
41
42  clocks:
43    minItems: 1
44    maxItems: 5
45
46  clock-names:
47    minItems: 1
48    maxItems: 5
49
50  "#clock-cells":
51    const: 1
52
53  reg:
54    maxItems: 1
55
56allOf:
57  - if:
58      properties:
59        compatible:
60          contains:
61            const: samsung,exynos850-cmu-top
62
63    then:
64      properties:
65        clocks:
66          items:
67            - description: External reference clock (26 MHz)
68
69        clock-names:
70          items:
71            - const: oscclk
72
73  - if:
74      properties:
75        compatible:
76          contains:
77            const: samsung,exynos850-cmu-apm
78
79    then:
80      properties:
81        clocks:
82          items:
83            - description: External reference clock (26 MHz)
84            - description: CMU_APM bus clock (from CMU_TOP)
85
86        clock-names:
87          items:
88            - const: oscclk
89            - const: dout_clkcmu_apm_bus
90
91  - if:
92      properties:
93        compatible:
94          contains:
95            const: samsung,exynos850-cmu-cmgp
96
97    then:
98      properties:
99        clocks:
100          items:
101            - description: External reference clock (26 MHz)
102            - description: CMU_CMGP bus clock (from CMU_APM)
103
104        clock-names:
105          items:
106            - const: oscclk
107            - const: gout_clkcmu_cmgp_bus
108
109  - if:
110      properties:
111        compatible:
112          contains:
113            const: samsung,exynos850-cmu-core
114
115    then:
116      properties:
117        clocks:
118          items:
119            - description: External reference clock (26 MHz)
120            - description: CMU_CORE bus clock (from CMU_TOP)
121            - description: CCI clock (from CMU_TOP)
122            - description: eMMC clock (from CMU_TOP)
123            - description: SSS clock (from CMU_TOP)
124
125        clock-names:
126          items:
127            - const: oscclk
128            - const: dout_core_bus
129            - const: dout_core_cci
130            - const: dout_core_mmc_embd
131            - const: dout_core_sss
132
133  - if:
134      properties:
135        compatible:
136          contains:
137            const: samsung,exynos850-cmu-dpu
138
139    then:
140      properties:
141        clocks:
142          items:
143            - description: External reference clock (26 MHz)
144            - description: DPU clock (from CMU_TOP)
145
146        clock-names:
147          items:
148            - const: oscclk
149            - const: dout_dpu
150
151  - if:
152      properties:
153        compatible:
154          contains:
155            const: samsung,exynos850-cmu-hsi
156
157    then:
158      properties:
159        clocks:
160          items:
161            - description: External reference clock (26 MHz)
162            - description: External RTC clock (32768 Hz)
163            - description: CMU_HSI bus clock (from CMU_TOP)
164            - description: SD card clock (from CMU_TOP)
165            - description: "USB 2.0 DRD clock (from CMU_TOP)"
166
167        clock-names:
168          items:
169            - const: oscclk
170            - const: rtcclk
171            - const: dout_hsi_bus
172            - const: dout_hsi_mmc_card
173            - const: dout_hsi_usb20drd
174
175  - if:
176      properties:
177        compatible:
178          contains:
179            const: samsung,exynos850-cmu-peri
180
181    then:
182      properties:
183        clocks:
184          items:
185            - description: External reference clock (26 MHz)
186            - description: CMU_PERI bus clock (from CMU_TOP)
187            - description: UART clock (from CMU_TOP)
188            - description: Parent clock for HSI2C and SPI (from CMU_TOP)
189
190        clock-names:
191          items:
192            - const: oscclk
193            - const: dout_peri_bus
194            - const: dout_peri_uart
195            - const: dout_peri_ip
196
197required:
198  - compatible
199  - "#clock-cells"
200  - clocks
201  - clock-names
202  - reg
203
204additionalProperties: false
205
206examples:
207  # Clock controller node for CMU_PERI
208  - |
209    #include <dt-bindings/clock/exynos850.h>
210
211    cmu_peri: clock-controller@10030000 {
212        compatible = "samsung,exynos850-cmu-peri";
213        reg = <0x10030000 0x8000>;
214        #clock-cells = <1>;
215
216        clocks = <&oscclk>, <&cmu_top CLK_DOUT_PERI_BUS>,
217                 <&cmu_top CLK_DOUT_PERI_UART>,
218                 <&cmu_top CLK_DOUT_PERI_IP>;
219        clock-names = "oscclk", "dout_peri_bus",
220                      "dout_peri_uart", "dout_peri_ip";
221    };
222
223...
224