xref: /linux/Documentation/devicetree/bindings/eeprom/at24.yaml (revision c1ec80e54afd0460d02b29a5731fd2a7b31f400b) 
1# SPDX-License-Identifier: GPL-2.0-only
2# Copyright 2019 BayLibre SAS
3%YAML 1.2
4---
5$id: http://devicetree.org/schemas/eeprom/at24.yaml#
6$schema: http://devicetree.org/meta-schemas/core.yaml#
7
8title: I2C EEPROMs compatible with Atmel's AT24
9
10maintainers:
11  - Bartosz Golaszewski <bgolaszewski@baylibre.com>
12
13allOf:
14  - $ref: /schemas/nvmem/nvmem.yaml
15  - $ref: /schemas/nvmem/nvmem-deprecated-cells.yaml
16
17select:
18  properties:
19    compatible:
20      contains:
21        anyOf:
22          - pattern: "^atmel,(24(c|cs|mac)[0-9]+|spd)$"
23          - enum: ["microchip,24aa025e48", "microchip,24aa025e64"]
24  required:
25    - compatible
26
27properties:
28  $nodename:
29    pattern: "^eeprom@[0-9a-f]{1,2}$"
30
31  # There are multiple known vendors who manufacture EEPROM chips compatible
32  # with Atmel's AT24. The compatible string requires either a single item
33  # if the memory comes from Atmel (in which case the vendor part must be
34  # 'atmel') or two items with the same 'model' part where the vendor part of
35  # the first one is the actual manufacturer and the second item is the
36  # corresponding 'atmel,<model>' from Atmel.
37  compatible:
38    oneOf:
39      - allOf:
40          - minItems: 1
41            items:
42              - pattern: "^(atmel|catalyst|microchip|nxp|ramtron|renesas|rohm|st),(24(c|cs|lc|mac)[0-9]+|spd)$"
43              - pattern: "^atmel,(24(c|cs|mac)[0-9]+|spd)$"
44          - oneOf:
45              - items:
46                  pattern: c00$
47              - items:
48                  pattern: c01$
49              - items:
50                  pattern: cs01$
51              - items:
52                  pattern: c02$
53              - items:
54                  pattern: cs02$
55              - items:
56                  pattern: mac402$
57              - items:
58                  pattern: mac602$
59              - items:
60                  pattern: c04$
61              - items:
62                  pattern: cs04$
63              - items:
64                  pattern: c08$
65              - items:
66                  pattern: cs08$
67              - items:
68                  pattern: c16$
69              - items:
70                  pattern: cs16$
71              - items:
72                  pattern: c32$
73              - items:
74                  pattern: cs32$
75              - items:
76                  pattern: c64$
77              - items:
78                  pattern: cs64$
79              - items:
80                  pattern: c128$
81              - items:
82                  pattern: cs128$
83              - items:
84                  pattern: c256$
85              - items:
86                  pattern: cs256$
87              - items:
88                  pattern: c512$
89              - items:
90                  pattern: cs512$
91              - items:
92                  pattern: c1024$
93              - items:
94                  pattern: cs1024$
95              - items:
96                  pattern: c1025$
97              - items:
98                  pattern: cs1025$
99              - items:
100                  pattern: c2048$
101              - items:
102                  pattern: cs2048$
103              - items:
104                  pattern: spd$
105      # These are special cases that don't conform to the above pattern.
106      # Each requires a standard at24 model as fallback.
107      - items:
108          - const: belling,bl24c16a
109          - const: atmel,24c16
110      - items:
111          - enum:
112              - rohm,br24g01
113              - rohm,br24t01
114          - const: atmel,24c01
115      - items:
116          - enum:
117              - nxp,se97b
118              - renesas,r1ex24002
119          - const: atmel,24c02
120      - items:
121          - enum:
122              - onnn,cat24c04
123              - onnn,cat24c05
124              - rohm,br24g04
125          - const: atmel,24c04
126      - items:
127          - const: renesas,r1ex24016
128          - const: atmel,24c16
129      - items:
130          - const: giantec,gt24c32a
131          - const: atmel,24c32
132      - items:
133          - enum:
134              - renesas,r1ex24128
135              - samsung,s524ad0xd1
136          - const: atmel,24c128
137      - items:
138          - const: microchip,24aa025e48
139      - items:
140          - const: microchip,24aa025e64
141      - pattern: '^atmel,24c(32|64)d-wl$' # Actual vendor is st
142
143  label:
144    description: Descriptive name of the EEPROM.
145
146  reg:
147    maxItems: 1
148
149  pagesize:
150    description:
151      The length of the pagesize for writing. Please consult the
152      manual of your device, that value varies a lot. A wrong value
153      may result in data loss! If not specified, a safety value of
154      '1' is used which will be very slow.
155    $ref: /schemas/types.yaml#/definitions/uint32
156    enum: [1, 8, 16, 32, 64, 128, 256]
157    default: 1
158
159  read-only:
160    $ref: /schemas/types.yaml#/definitions/flag
161    description:
162      Disables writes to the eeprom.
163
164  size:
165    $ref: /schemas/types.yaml#/definitions/uint32
166    description:
167      Total eeprom size in bytes.
168
169  no-read-rollover:
170    $ref: /schemas/types.yaml#/definitions/flag
171    description:
172      Indicates that the multi-address eeprom does not automatically roll
173      over reads to the next slave address. Please consult the manual of
174      your device.
175
176  wp-gpios: true
177
178  address-width:
179    description:
180      Number of address bits.
181    $ref: /schemas/types.yaml#/definitions/uint32
182    default: 8
183    enum: [ 8, 16 ]
184
185  num-addresses:
186    description:
187      Total number of i2c slave addresses this device takes.
188    $ref: /schemas/types.yaml#/definitions/uint32
189    default: 1
190    minimum: 1
191    maximum: 8
192
193  vcc-supply:
194    description:
195      phandle of the regulator that provides the supply voltage.
196
197required:
198  - compatible
199  - reg
200
201unevaluatedProperties: false
202
203examples:
204  - |
205    i2c {
206      #address-cells = <1>;
207      #size-cells = <0>;
208
209      eeprom@52 {
210          compatible = "microchip,24c32", "atmel,24c32";
211          reg = <0x52>;
212          pagesize = <32>;
213          wp-gpios = <&gpio1 3 0>;
214          num-addresses = <8>;
215      };
216    };
217...
218