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
7 title: SPI EEPROMs or FRAMs compatible with Atmel's AT25
8
9 maintainers:
10 - Christian Eggers <ceggers@arri.de>
11
12 properties:
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
102 required:
103 - compatible
104 - reg
105 - spi-max-frequency
106
107 allOf:
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
122 unevaluatedProperties: false
123
124 examples:
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 };
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