0001 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
0002 %YAML 1.2
0003 ---
0004 $id: "http://devicetree.org/schemas/eeprom/at25.yaml#"
0005 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
0006
0007 title: SPI EEPROMs or FRAMs compatible with Atmel's AT25
0008
0009 maintainers:
0010 - Christian Eggers <ceggers@arri.de>
0011
0012 properties:
0013 $nodename:
0014 anyOf:
0015 - pattern: "^eeprom@[0-9a-f]{1,2}$"
0016 - pattern: "^fram@[0-9a-f]{1,2}$"
0017
0018 # There are multiple known vendors who manufacture EEPROM chips compatible
0019 # with Atmel's AT25. The compatible string requires two items where the
0020 # 'vendor' and 'model' parts of the first are the actual chip and the second
0021 # item is fixed to "atmel,at25". Some existing bindings only have the
0022 # "atmel,at25" part and should be fixed by somebody who knows vendor and
0023 # product.
0024 compatible:
0025 oneOf:
0026 - items:
0027 - enum:
0028 - anvo,anv32e61w
0029 - atmel,at25256B
0030 - fujitsu,mb85rs1mt
0031 - fujitsu,mb85rs64
0032 - microchip,at25160bn
0033 - microchip,25lc040
0034 - st,m95m02
0035 - st,m95256
0036 - cypress,fm25
0037
0038 - const: atmel,at25
0039
0040 # Please don't use this alternative for new bindings.
0041 - items:
0042 - const: atmel,at25
0043
0044 reg:
0045 maxItems: 1
0046
0047 pagesize:
0048 $ref: /schemas/types.yaml#/definitions/uint32
0049 enum: [1, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072]
0050 description:
0051 Size of the eeprom page. FRAMs don't have pages.
0052
0053 size:
0054 $ref: /schemas/types.yaml#/definitions/uint32
0055 description:
0056 Total eeprom size in bytes.
0057
0058 address-width:
0059 $ref: /schemas/types.yaml#/definitions/uint32
0060 enum: [ 8, 9, 16, 24 ]
0061 description:
0062 Number of address bits.
0063 For 9 bits, the MSB of the address is sent as bit 3 of the instruction
0064 byte, before the address byte.
0065
0066 spi-cpha: true
0067
0068 spi-cpol: true
0069
0070 read-only:
0071 description:
0072 Disable writes to the eeprom.
0073 type: boolean
0074
0075 wp-gpios:
0076 maxItems: 1
0077 description:
0078 GPIO to which the write-protect pin of the chip is connected.
0079
0080 # Deprecated: at25,byte-len, at25,addr-mode, at25,page-size
0081 at25,byte-len:
0082 $ref: /schemas/types.yaml#/definitions/uint32
0083 description:
0084 Total eeprom size in bytes. Deprecated, use "size" property instead.
0085 deprecated: true
0086
0087 at25,addr-mode:
0088 $ref: /schemas/types.yaml#/definitions/uint32
0089 description:
0090 Addr-mode flags, as defined in include/linux/spi/eeprom.h.
0091 Deprecated, use "address-width" property instead.
0092 deprecated: true
0093
0094 at25,page-size:
0095 $ref: /schemas/types.yaml#/definitions/uint32
0096 description:
0097 Size of the eeprom page. Deprecated, use "pagesize" property instead.
0098 deprecated: true
0099
0100 required:
0101 - compatible
0102 - reg
0103 - spi-max-frequency
0104
0105 allOf:
0106 - $ref: /schemas/spi/spi-peripheral-props.yaml#
0107 - if:
0108 properties:
0109 compatible:
0110 not:
0111 contains:
0112 const: cypress,fm25
0113 then:
0114 required:
0115 - pagesize
0116 - size
0117 - address-width
0118
0119 unevaluatedProperties: false
0120
0121 examples:
0122 - |
0123 #include <dt-bindings/gpio/gpio.h>
0124 spi0 {
0125 #address-cells = <1>;
0126 #size-cells = <0>;
0127
0128 eeprom@0 {
0129 compatible = "st,m95256", "atmel,at25";
0130 reg = <0>;
0131 spi-max-frequency = <5000000>;
0132 spi-cpha;
0133 spi-cpol;
0134 wp-gpios = <&gpio1 3 0>;
0135
0136 pagesize = <64>;
0137 size = <32768>;
0138 address-width = <16>;
0139 };
0140
0141 fram@1 {
0142 compatible = "cypress,fm25", "atmel,at25";
0143 reg = <1>;
0144 spi-max-frequency = <40000000>;
0145 };
0146 };
