Merge tag 'drm-next-2020-12-24' of git://anongit.freedesktop.org/drm/drm
[linux-2.6-microblaze.git] / Documentation / devicetree / bindings / clock / idt,versaclock5.yaml
1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/clock/idt,versaclock5.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Binding for IDT VersaClock 5 and 6 programmable I2C clock generators
8
9 description: |
10   The IDT VersaClock 5 and VersaClock 6 are programmable I2C
11   clock generators providing from 3 to 12 output clocks.
12
13   When referencing the provided clock in the DT using phandle and clock
14   specifier, the following mapping applies:
15
16   - 5P49V5923:
17     0 -- OUT0_SEL_I2CB
18     1 -- OUT1
19     2 -- OUT2
20
21   - 5P49V5933:
22     0 -- OUT0_SEL_I2CB
23     1 -- OUT1
24     2 -- OUT4
25
26   - other parts:
27     0 -- OUT0_SEL_I2CB
28     1 -- OUT1
29     2 -- OUT2
30     3 -- OUT3
31     4 -- OUT4
32
33 maintainers:
34   - Luca Ceresoli <luca@lucaceresoli.net>
35
36 properties:
37   compatible:
38     enum:
39       - idt,5p49v5923
40       - idt,5p49v5925
41       - idt,5p49v5933
42       - idt,5p49v5935
43       - idt,5p49v6901
44       - idt,5p49v6965
45
46   reg:
47     description: I2C device address
48     enum: [ 0x68, 0x6a ]
49
50   '#clock-cells':
51     const: 1
52
53   clock-names:
54     minItems: 1
55     maxItems: 2
56     items:
57       enum: [ xin, clkin ]
58   clocks:
59     minItems: 1
60     maxItems: 2
61
62 patternProperties:
63   "^OUT[1-4]$":
64     type: object
65     description:
66       Description of one of the outputs (OUT1..OUT4). See "Clock1 Output
67       Configuration" in the Versaclock 5/6/6E Family Register Description
68       and Programming Guide.
69     properties:
70       idt,mode:
71         description:
72           The output drive mode. Values defined in dt-bindings/clk/versaclock.h
73         $ref: /schemas/types.yaml#/definitions/uint32
74         minimum: 0
75         maximum: 6
76       idt,voltage-microvolt:
77         description: The output drive voltage.
78         enum: [ 1800000, 2500000, 3300000 ]
79       idt,slew-percent:
80         description: The Slew rate control for CMOS single-ended.
81         $ref: /schemas/types.yaml#/definitions/uint32
82         enum: [ 80, 85, 90, 100 ]
83
84 required:
85   - compatible
86   - reg
87   - '#clock-cells'
88
89 allOf:
90   - if:
91       properties:
92         compatible:
93           enum:
94             - idt,5p49v5933
95             - idt,5p49v5935
96     then:
97       # Devices with builtin crystal + optional external input
98       properties:
99         clock-names:
100           const: clkin
101         clocks:
102           maxItems: 1
103     else:
104       # Devices without builtin crystal
105       required:
106         - clock-names
107         - clocks
108
109 additionalProperties: false
110
111 examples:
112   - |
113     #include <dt-bindings/clk/versaclock.h>
114
115     /* 25MHz reference crystal */
116     ref25: ref25m {
117         compatible = "fixed-clock";
118         #clock-cells = <0>;
119         clock-frequency = <25000000>;
120     };
121
122     i2c@0 {
123         reg = <0x0 0x100>;
124         #address-cells = <1>;
125         #size-cells = <0>;
126
127         /* IDT 5P49V5923 I2C clock generator */
128         vc5: clock-generator@6a {
129             compatible = "idt,5p49v5923";
130             reg = <0x6a>;
131             #clock-cells = <1>;
132
133             /* Connect XIN input to 25MHz reference */
134             clocks = <&ref25m>;
135             clock-names = "xin";
136
137             OUT1 {
138                 idt,drive-mode = <VC5_CMOSD>;
139                 idt,voltage-microvolts = <1800000>;
140                 idt,slew-percent = <80>;
141             };
142
143             OUT4 {
144                 idt,drive-mode = <VC5_LVDS>;
145             };
146         };
147     };
148
149     /* Consumer referencing the 5P49V5923 pin OUT1 */
150     consumer {
151         /* ... */
152         clocks = <&vc5 1>;
153         /* ... */
154     };
155
156 ...