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Diffstat (limited to 'Documentation/devicetree/bindings/eeprom/at24.yaml')
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1 files changed, 188 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/eeprom/at24.yaml b/Documentation/devicetree/bindings/eeprom/at24.yaml new file mode 100644 index 000000000000..e8778560d966 --- /dev/null +++ b/Documentation/devicetree/bindings/eeprom/at24.yaml @@ -0,0 +1,188 @@ +# SPDX-License-Identifier: GPL-2.0-only +# Copyright 2019 BayLibre SAS +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/eeprom/at24.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: I2C EEPROMs compatible with Atmel's AT24 + +maintainers: + - Bartosz Golaszewski <bgolaszewski@baylibre.com> + +select: + properties: + compatible: + contains: + pattern: "^atmel,(24(c|cs|mac)[0-9]+|spd)$" + required: + - compatible + +properties: + $nodename: + pattern: "^eeprom@[0-9a-f]{1,2}$" + + # There are multiple known vendors who manufacture EEPROM chips compatible + # with Atmel's AT24. The compatible string requires either a single item + # if the memory comes from Atmel (in which case the vendor part must be + # 'atmel') or two items with the same 'model' part where the vendor part of + # the first one is the actual manufacturer and the second item is the + # corresponding 'atmel,<model>' from Atmel. + compatible: + oneOf: + - allOf: + - minItems: 1 + maxItems: 2 + items: + - pattern: "^(atmel|catalyst|microchip|nxp|ramtron|renesas|rohm|st),(24(c|cs|mac)[0-9]+|spd)$" + - pattern: "^atmel,(24(c|cs|mac)[0-9]+|spd)$" + - oneOf: + - items: + pattern: c00$ + - items: + pattern: c01$ + - items: + pattern: cs01$ + - items: + pattern: c02$ + - items: + pattern: cs02$ + - items: + pattern: mac402$ + - items: + pattern: mac602$ + - items: + pattern: c04$ + - items: + pattern: cs04$ + - items: + pattern: c08$ + - items: + pattern: cs08$ + - items: + pattern: c16$ + - items: + pattern: cs16$ + - items: + pattern: c32$ + - items: + pattern: cs32$ + - items: + pattern: c64$ + - items: + pattern: cs64$ + - items: + pattern: c128$ + - items: + pattern: cs128$ + - items: + pattern: c256$ + - items: + pattern: cs256$ + - items: + pattern: c512$ + - items: + pattern: cs512$ + - items: + pattern: c1024$ + - items: + pattern: cs1024$ + - items: + pattern: c2048$ + - items: + pattern: cs2048$ + - items: + pattern: spd$ + # These are special cases that don't conform to the above pattern. + # Each requires a standard at24 model as fallback. + - items: + - const: rohm,br24t01 + - const: atmel,24c01 + - items: + - const: nxp,se97b + - const: atmel,24c02 + - items: + - const: renesas,r1ex24002 + - const: atmel,24c02 + - items: + - const: renesas,r1ex24016 + - const: atmel,24c16 + - items: + - const: giantec,gt24c32a + - const: atmel,24c32 + - items: + - const: renesas,r1ex24128 + - const: atmel,24c128 + + reg: + maxItems: 1 + + pagesize: + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + description: + The length of the pagesize for writing. Please consult the + manual of your device, that value varies a lot. A wrong value + may result in data loss! If not specified, a safety value of + '1' is used which will be very slow. + enum: [ 1, 8, 16, 32, 64, 128, 258 ] + default: 1 + + read-only: + $ref: /schemas/types.yaml#definitions/flag + description: + Disables writes to the eeprom. + + size: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Total eeprom size in bytes. + + no-read-rollover: + $ref: /schemas/types.yaml#definitions/flag + description: + Indicates that the multi-address eeprom does not automatically roll + over reads to the next slave address. Please consult the manual of + your device. + + wp-gpios: + description: + GPIO to which the write-protect pin of the chip is connected. + maxItems: 1 + + address-width: + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + description: + Number of address bits. + default: 8 + enum: [ 8, 16 ] + + num-addresses: + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32 + description: + Total number of i2c slave addresses this device takes. + default: 1 + minimum: 1 + maximum: 8 + +required: + - compatible + - reg + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + eeprom@52 { + compatible = "microchip,24c32", "atmel,24c32"; + reg = <0x52>; + pagesize = <32>; + wp-gpios = <&gpio1 3 0>; + num-addresses = <8>; + }; + }; +... |