xref: /linux/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml (revision 90d32e92011eaae8e70a9169b4e7acf4ca8f9d3a) 
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
7title: Google GS101 SoC clock controller
8
9maintainers:
10  - Peter Griffin <peter.griffin@linaro.org>
11
12description: |
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
27properties:
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
52required:
53  - compatible
54  - "#clock-cells"
55  - clocks
56  - clock-names
57  - reg
58
59allOf:
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
166additionalProperties: false
167
168examples:
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...
182