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|
# 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>;
};
};
...
|
