xref: /linux/Documentation/devicetree/bindings/eeprom/at25.yaml (revision 41776e40082b06c79c3c069559d6ab6664394113) 
1# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/eeprom/at25.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: SPI EEPROMs or FRAMs compatible with Atmel's AT25
8
9maintainers:
10  - Christian Eggers <ceggers@arri.de>
11
12properties:
13  $nodename:
14    anyOf:
15      - pattern: "^eeprom@[0-9a-f]{1,2}$"
16      - pattern: "^fram@[0-9a-f]{1,2}$"
17
18  # There are multiple known vendors who manufacture EEPROM chips compatible
19  # with Atmel's AT25. The compatible string requires two items where the
20  # 'vendor' and 'model' parts of the first are the actual chip and the second
21  # item is fixed to "atmel,at25". Some existing bindings only have the
22  # "atmel,at25" part and should be fixed by somebody who knows vendor and
23  # product.
24  compatible:
25    oneOf:
26      - items:
27          - enum:
28              - anvo,anv32e61w
29              - atmel,at25256B
30              - fujitsu,mb85rs1mt
31              - fujitsu,mb85rs256
32              - fujitsu,mb85rs64
33              - microchip,at25160bn
34              - microchip,25lc040
35              - st,m95m02
36              - st,m95256
37              - st,m95640
38              - cypress,fm25
39
40          - const: atmel,at25
41
42      # Please don't use this alternative for new bindings.
43      - items:
44          - const: atmel,at25
45
46  reg:
47    maxItems: 1
48
49  pagesize:
50    $ref: /schemas/types.yaml#/definitions/uint32
51    enum: [1, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072]
52    description:
53      Size of the eeprom page. FRAMs don't have pages.
54
55  size:
56    $ref: /schemas/types.yaml#/definitions/uint32
57    description:
58      Total eeprom size in bytes.
59
60  address-width:
61    $ref: /schemas/types.yaml#/definitions/uint32
62    enum: [ 8, 9, 16, 24 ]
63    description:
64      Number of address bits.
65      For 9 bits, the MSB of the address is sent as bit 3 of the instruction
66      byte, before the address byte.
67
68  spi-cpha: true
69
70  spi-cpol: true
71
72  read-only:
73    description:
74      Disable writes to the eeprom.
75    type: boolean
76
77  wp-gpios:
78    maxItems: 1
79    description:
80      GPIO to which the write-protect pin of the chip is connected.
81
82  # Deprecated: at25,byte-len, at25,addr-mode, at25,page-size
83  at25,byte-len:
84    $ref: /schemas/types.yaml#/definitions/uint32
85    description:
86      Total eeprom size in bytes. Deprecated, use "size" property instead.
87    deprecated: true
88
89  at25,addr-mode:
90    $ref: /schemas/types.yaml#/definitions/uint32
91    description:
92      Addr-mode flags, as defined in include/linux/spi/eeprom.h.
93      Deprecated, use "address-width" property instead.
94    deprecated: true
95
96  at25,page-size:
97    $ref: /schemas/types.yaml#/definitions/uint32
98    description:
99      Size of the eeprom page. Deprecated, use "pagesize" property instead.
100    deprecated: true
101
102required:
103  - compatible
104  - reg
105  - spi-max-frequency
106
107allOf:
108  - $ref: /schemas/spi/spi-peripheral-props.yaml#
109  - $ref: /schemas/nvmem/nvmem.yaml
110  - if:
111      properties:
112        compatible:
113          not:
114            contains:
115              const: cypress,fm25
116    then:
117      required:
118        - pagesize
119        - size
120        - address-width
121
122unevaluatedProperties: false
123
124examples:
125  - |
126    #include <dt-bindings/gpio/gpio.h>
127    spi {
128        #address-cells = <1>;
129        #size-cells = <0>;
130
131        eeprom@0 {
132            compatible = "st,m95256", "atmel,at25";
133            reg = <0>;
134            spi-max-frequency = <5000000>;
135            spi-cpha;
136            spi-cpol;
137            wp-gpios = <&gpio1 3 0>;
138
139            pagesize = <64>;
140            size = <32768>;
141            address-width = <16>;
142        };
143
144        fram@1 {
145            compatible = "cypress,fm25", "atmel,at25";
146            reg = <1>;
147            spi-max-frequency = <40000000>;
148        };
149    };
150