Commit 7f3bf420 authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Rob Herring

dt-bindings: at24: convert the binding document to yaml

Convert the binding document for at24 EEPROMs from txt to yaml. The
compatible property uses a regex pattern to address all the possible
combinations of "vendor,model" strings.
Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
[robh: rework compatible schema, fix missing allOf for $ref, fix errors in example]
Signed-off-by: default avatarRob Herring <robh@kernel.org>
[Bartosz: added comments explaining the compatible property]
Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent 951d4885
EEPROMs (I2C)
Required properties:
- compatible: Must be a "<manufacturer>,<model>" pair. The following <model>
values are supported (assuming "atmel" as manufacturer):
"atmel,24c00",
"atmel,24c01",
"atmel,24cs01",
"atmel,24c02",
"atmel,24cs02",
"atmel,24mac402",
"atmel,24mac602",
"atmel,spd",
"atmel,24c04",
"atmel,24cs04",
"atmel,24c08",
"atmel,24cs08",
"atmel,24c16",
"atmel,24cs16",
"atmel,24c32",
"atmel,24cs32",
"atmel,24c64",
"atmel,24cs64",
"atmel,24c128",
"atmel,24c256",
"atmel,24c512",
"atmel,24c1024",
"atmel,24c2048",
If <manufacturer> is not "atmel", then a fallback must be used
with the same <model> and "atmel" as manufacturer.
Example:
compatible = "microchip,24c128", "atmel,24c128";
Supported manufacturers are:
"catalyst",
"microchip",
"nxp",
"ramtron",
"renesas",
"rohm",
"st",
Some vendors use different model names for chips which are just
variants of the above. Known such exceptions are listed below:
"nxp,se97b" - the fallback is "atmel,24c02",
"renesas,r1ex24002" - the fallback is "atmel,24c02"
"renesas,r1ex24016" - the fallback is "atmel,24c16"
"renesas,r1ex24128" - the fallback is "atmel,24c128"
"rohm,br24t01" - the fallback is "atmel,24c01"
- reg: The I2C address of the EEPROM.
Optional properties:
- pagesize: 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.
- read-only: This parameterless property disables writes to the eeprom.
- size: Total eeprom size in bytes.
- no-read-rollover: This parameterless property 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: GPIO to which the write-protect pin of the chip is connected.
- address-width: number of address bits (one of 8, 16).
- num-addresses: total number of i2c slave addresses this device takes
Example:
eeprom@52 {
compatible = "atmel,24c32";
reg = <0x52>;
pagesize = <32>;
wp-gpios = <&gpio1 3 0>;
num-addresses = <8>;
};
This file has been moved to at24.yaml.
# 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: 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>;
};
};
...
......@@ -2699,7 +2699,7 @@ M: Bartosz Golaszewski <bgolaszewski@baylibre.com>
L: linux-i2c@vger.kernel.org
T: git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
S: Maintained
F: Documentation/devicetree/bindings/eeprom/at24.txt
F: Documentation/devicetree/bindings/eeprom/at24.yaml
F: drivers/misc/eeprom/at24.c
ATA OVER ETHERNET (AOE) DRIVER
......
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