xref: /freebsd/sys/contrib/device-tree/Bindings/eeprom/at25.yaml (revision 25ecdc7d52770caf1c9b44b5ec11f468f6b636f3) 
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 compatible with Atmel's AT25
8
9maintainers:
10  - Christian Eggers <ceggers@arri.de>
11
12properties:
13  $nodename:
14    pattern: "^eeprom@[0-9a-f]{1,2}$"
15
16  # There are multiple known vendors who manufacture EEPROM chips compatible
17  # with Atmel's AT25. The compatible string requires two items where the
18  # 'vendor' and 'model' parts of the first are the actual chip and the second
19  # item is fixed to "atmel,at25". Some existing bindings only have the
20  # "atmel,at25" part and should be fixed by somebody who knows vendor and
21  # product.
22  compatible:
23    oneOf:
24      - items:
25          - enum:
26              - anvo,anv32e61w
27              - atmel,at25256B
28              - fujitsu,mb85rs1mt
29              - fujitsu,mb85rs64
30              - microchip,at25160bn
31              - microchip,25lc040
32              - st,m95m02
33              - st,m95256
34
35          - const: atmel,at25
36
37      # Please don't use this alternative for new bindings.
38      - items:
39          - const: atmel,at25
40
41  reg:
42    description:
43      Chip select number.
44
45  spi-max-frequency: true
46
47  pagesize:
48    $ref: /schemas/types.yaml#definitions/uint32
49    enum: [1, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072]
50    description:
51      Size of the eeprom page.
52
53  size:
54    $ref: /schemas/types.yaml#definitions/uint32
55    description:
56      Total eeprom size in bytes.
57
58  address-width:
59    $ref: /schemas/types.yaml#/definitions/uint32
60    enum: [ 8, 9, 16, 24 ]
61    description:
62      Number of address bits.
63      For 9 bits, the MSB of the address is sent as bit 3 of the instruction
64      byte, before the address byte.
65
66  spi-cpha: true
67
68  spi-cpol: true
69
70  read-only:
71    description:
72      Disable writes to the eeprom.
73    type: boolean
74
75  wp-gpios:
76    maxItems: 1
77    description:
78      GPIO to which the write-protect pin of the chip is connected.
79
80  # Deprecated: at25,byte-len, at25,addr-mode, at25,page-size
81  at25,byte-len:
82    $ref: /schemas/types.yaml#/definitions/uint32
83    description:
84      Total eeprom size in bytes. Deprecated, use "size" property instead.
85    deprecated: true
86
87  at25,addr-mode:
88    $ref: /schemas/types.yaml#/definitions/uint32
89    description:
90      Addr-mode flags, as defined in include/linux/spi/eeprom.h.
91      Deprecated, use "address-width" property instead.
92    deprecated: true
93
94  at25,page-size:
95    $ref: /schemas/types.yaml#/definitions/uint32
96    description:
97      Size of the eeprom page. Deprecated, use "pagesize" property instead.
98    deprecated: true
99
100required:
101  - compatible
102  - reg
103  - spi-max-frequency
104  - pagesize
105  - size
106  - address-width
107
108additionalProperties: false
109
110examples:
111  - |
112    #include <dt-bindings/gpio/gpio.h>
113    spi0 {
114        #address-cells = <1>;
115        #size-cells = <0>;
116
117        eeprom@0 {
118            compatible = "st,m95256", "atmel,at25";
119            reg = <0>;
120            spi-max-frequency = <5000000>;
121            spi-cpha;
122            spi-cpol;
123            wp-gpios = <&gpio1 3 0>;
124
125            pagesize = <64>;
126            size = <32768>;
127            address-width = <16>;
128        };
129    };
130