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
8 title: I2C EEPROMs compatible with Atmel's AT24
9
10 maintainers:
11 - Bartosz Golaszewski <bgolaszewski@baylibre.com>
12
13 allOf:
14 - $ref: /schemas/nvmem/nvmem.yaml
15 - $ref: /schemas/nvmem/nvmem-deprecated-cells.yaml
16
17 select:
18 properties:
19 compatible:
20 contains:
21 anyOf:
22 - pattern: "^atmel,(24(c|cs|mac)[0-9]+|spd)$"
23 - enum: ["microchip,24aa025e48", "microchip,24aa025e64"]
24 required:
25 - compatible
26
27 properties:
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 - enum:
109 - rohm,br24g01
110 - rohm,br24t01
111 - const: atmel,24c01
112 - items:
113 - enum:
114 - nxp,se97b
115 - renesas,r1ex24002
116 - const: atmel,24c02
117 - items:
118 - enum:
119 - giantec,gt24c04a
120 - onnn,cat24c04
121 - onnn,cat24c05
122 - rohm,br24g04
123 - const: atmel,24c04
124 - items:
125 - enum:
126 - belling,bl24c16a
127 - renesas,r1ex24016
128 - const: atmel,24c16
129 - items:
130 - const: giantec,gt24c32a
131 - const: atmel,24c32
132 - items:
133 - const: onnn,n24s64b
134 - const: atmel,24c64
135 - items:
136 - enum:
137 - renesas,r1ex24128
138 - samsung,s524ad0xd1
139 - const: atmel,24c128
140 - items:
141 - const: microchip,24aa025e48
142 - items:
143 - const: microchip,24aa025e64
144 - pattern: '^atmel,24c(32|64)d-wl$' # Actual vendor is st
145
146 label:
147 description: Descriptive name of the EEPROM.
148
149 reg:
150 maxItems: 1
151
152 pagesize:
153 description:
154 The length of the pagesize for writing. Please consult the
155 manual of your device, that value varies a lot. A wrong value
156 may result in data loss! If not specified, a safety value of
157 '1' is used which will be very slow.
158 $ref: /schemas/types.yaml#/definitions/uint32
159 enum: [1, 8, 16, 32, 64, 128, 256]
160 default: 1
161
162 read-only:
163 $ref: /schemas/types.yaml#/definitions/flag
164 description:
165 Disables writes to the eeprom.
166
167 size:
168 $ref: /schemas/types.yaml#/definitions/uint32
169 description:
170 Total eeprom size in bytes.
171
172 no-read-rollover:
173 $ref: /schemas/types.yaml#/definitions/flag
174 description:
175 Indicates that the multi-address eeprom does not automatically roll
176 over reads to the next slave address. Please consult the manual of
177 your device.
178
179 wp-gpios: true
180
181 address-width:
182 description:
183 Number of address bits.
184 $ref: /schemas/types.yaml#/definitions/uint32
185 default: 8
186 enum: [ 8, 16 ]
187
188 num-addresses:
189 description:
190 Total number of i2c slave addresses this device takes.
191 $ref: /schemas/types.yaml#/definitions/uint32
192 default: 1
193 minimum: 1
194 maximum: 8
195
196 vcc-supply:
197 description:
198 phandle of the regulator that provides the supply voltage.
199
200 required:
201 - compatible
202 - reg
203
204 unevaluatedProperties: false
205
206 examples:
207 - |
208 i2c {
209 #address-cells = <1>;
210 #size-cells = <0>;
211
212 eeprom@52 {
213 compatible = "microchip,24c32", "atmel,24c32";
214 reg = <0x52>;
215 pagesize = <32>;
216 wp-gpios = <&gpio1 3 0>;
217 num-addresses = <8>;
218 };
219 };
220 ...
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