mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 10:56:40 +00:00
2fa0a53059
Even the DT maintainer gets confused. The schema in dt-schema was wrong
too, so this was passing validation until trying to add some common
incorrect patterns to check.
Fixes: 58fbe999ff ("dt-bindings: example-schema: Add some additional examples and commentary")
Signed-off-by: Rob Herring <robh@kernel.org>
238 lines
7.8 KiB
YAML
238 lines
7.8 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
|
|
# Copyright 2018 Linaro Ltd.
|
|
%YAML 1.2
|
|
---
|
|
# All the top-level keys are standard json-schema keywords except for
|
|
# 'maintainers' and 'select'
|
|
|
|
# $id is a unique identifier based on the filename. There may or may not be a
|
|
# file present at the URL.
|
|
$id: "http://devicetree.org/schemas/example-schema.yaml#"
|
|
# $schema is the meta-schema this schema should be validated with.
|
|
$schema: "http://devicetree.org/meta-schemas/core.yaml#"
|
|
|
|
title: An example schema annotated with jsonschema details
|
|
|
|
maintainers:
|
|
- Rob Herring <robh@kernel.org>
|
|
|
|
description: |
|
|
A more detailed multi-line description of the binding.
|
|
|
|
Details about the hardware device and any links to datasheets can go here.
|
|
|
|
Literal blocks are marked with the '|' at the beginning. The end is marked by
|
|
indentation less than the first line of the literal block. Lines also cannot
|
|
begin with a tab character.
|
|
|
|
select: false
|
|
# 'select' is a schema applied to a DT node to determine if this binding
|
|
# schema should be applied to the node. It is optional and by default the
|
|
# possible compatible strings are extracted and used to match.
|
|
|
|
# In this case, a 'false' schema will never match.
|
|
|
|
properties:
|
|
# A dictionary of DT properties for this binding schema
|
|
compatible:
|
|
# More complicated schema can use oneOf (XOR), anyOf (OR), or allOf (AND)
|
|
# to handle different conditions.
|
|
# In this case, it's needed to handle a variable number of values as there
|
|
# isn't another way to express a constraint of the last string value.
|
|
# The boolean schema must be a list of schemas.
|
|
oneOf:
|
|
- items:
|
|
# items is a list of possible values for the property. The number of
|
|
# values is determined by the number of elements in the list.
|
|
# Order in lists is significant, order in dicts is not
|
|
# Must be one of the 1st enums followed by the 2nd enum
|
|
#
|
|
# Each element in items should be 'enum' or 'const'
|
|
- enum:
|
|
- vendor,soc4-ip
|
|
- vendor,soc3-ip
|
|
- vendor,soc2-ip
|
|
- enum:
|
|
- vendor,soc1-ip
|
|
# additionalItems being false is implied
|
|
# minItems/maxItems equal to 2 is implied
|
|
- items:
|
|
# 'const' is just a special case of an enum with a single possible value
|
|
- const: vendor,soc1-ip
|
|
|
|
reg:
|
|
# The core schema already checks that reg values are numbers, so device
|
|
# specific schema don't need to do those checks.
|
|
# The description of each element defines the order and implicitly defines
|
|
# the number of reg entries.
|
|
items:
|
|
- description: core registers
|
|
- description: aux registers
|
|
# minItems/maxItems equal to 2 is implied
|
|
|
|
reg-names:
|
|
# The core schema enforces this (*-names) is a string array
|
|
items:
|
|
- const: core
|
|
- const: aux
|
|
|
|
clocks:
|
|
# Cases that have only a single entry just need to express that with maxItems
|
|
maxItems: 1
|
|
description: bus clock. A description is only needed for a single item if
|
|
there's something unique to add.
|
|
|
|
clock-names:
|
|
items:
|
|
- const: bus
|
|
|
|
interrupts:
|
|
# Either 1 or 2 interrupts can be present
|
|
minItems: 1
|
|
maxItems: 2
|
|
items:
|
|
- description: tx or combined interrupt
|
|
- description: rx interrupt
|
|
description:
|
|
A variable number of interrupts warrants a description of what conditions
|
|
affect the number of interrupts. Otherwise, descriptions on standard
|
|
properties are not necessary.
|
|
|
|
interrupt-names:
|
|
# minItems must be specified here because the default would be 2
|
|
minItems: 1
|
|
maxItems: 2
|
|
items:
|
|
- const: tx irq
|
|
- const: rx irq
|
|
|
|
# Property names starting with '#' must be quoted
|
|
'#interrupt-cells':
|
|
# A simple case where the value must always be '2'.
|
|
# The core schema handles that this must be a single integer.
|
|
const: 2
|
|
|
|
interrupt-controller: true
|
|
# The core checks this is a boolean, so just have to list it here to be
|
|
# valid for this binding.
|
|
|
|
clock-frequency:
|
|
# The type is set in the core schema. Per device schema only need to set
|
|
# constraints on the possible values.
|
|
minimum: 100
|
|
maximum: 400000
|
|
# The value that should be used if the property is not present
|
|
default: 200
|
|
|
|
foo-gpios:
|
|
maxItems: 1
|
|
description: A connection of the 'foo' gpio line.
|
|
|
|
# *-supply is always a single phandle, so nothing more to define.
|
|
foo-supply: true
|
|
|
|
# Vendor specific properties
|
|
#
|
|
# Vendor specific properties have slightly different schema requirements than
|
|
# common properties. They must have at least a type definition and
|
|
# 'description'.
|
|
vendor,int-property:
|
|
description: Vendor specific properties must have a description
|
|
# 'allOf' is the json-schema way of subclassing a schema. Here the base
|
|
# type schema is referenced and then additional constraints on the values
|
|
# are added.
|
|
allOf:
|
|
- $ref: /schemas/types.yaml#/definitions/uint32
|
|
- enum: [2, 4, 6, 8, 10]
|
|
|
|
vendor,bool-property:
|
|
description: Vendor specific properties must have a description. Boolean
|
|
properties are one case where the json-schema 'type' keyword can be used
|
|
directly.
|
|
type: boolean
|
|
|
|
vendor,string-array-property:
|
|
description: Vendor specific properties should reference a type in the
|
|
core schema.
|
|
allOf:
|
|
- $ref: /schemas/types.yaml#/definitions/string-array
|
|
- items:
|
|
- enum: [ foo, bar ]
|
|
- enum: [ baz, boo ]
|
|
|
|
vendor,property-in-standard-units-microvolt:
|
|
description: Vendor specific properties having a standard unit suffix
|
|
don't need a type.
|
|
enum: [ 100, 200, 300 ]
|
|
|
|
child-node:
|
|
description: Child nodes are just another property from a json-schema
|
|
perspective.
|
|
type: object # DT nodes are json objects
|
|
properties:
|
|
vendor,a-child-node-property:
|
|
description: Child node properties have all the same schema
|
|
requirements.
|
|
type: boolean
|
|
|
|
required:
|
|
- vendor,a-child-node-property
|
|
|
|
# Describe the relationship between different properties
|
|
dependencies:
|
|
# 'vendor,bool-property' is only allowed when 'vendor,string-array-property'
|
|
# is present
|
|
vendor,bool-property: [ vendor,string-array-property ]
|
|
# Expressing 2 properties in both orders means all of the set of properties
|
|
# must be present or none of them.
|
|
vendor,string-array-property: [ vendor,bool-property ]
|
|
|
|
required:
|
|
- compatible
|
|
- reg
|
|
- interrupts
|
|
- interrupt-controller
|
|
|
|
# if/then schema can be used to handle conditions on a property affecting
|
|
# another property. A typical case is a specific 'compatible' value changes the
|
|
# constraints on other properties.
|
|
#
|
|
# For multiple 'if' schema, group them under an 'allOf'.
|
|
#
|
|
# If the conditionals become too unweldy, then it may be better to just split
|
|
# the binding into separate schema documents.
|
|
if:
|
|
properties:
|
|
compatible:
|
|
contains:
|
|
const: vendor,soc2-ip
|
|
then:
|
|
required:
|
|
- foo-supply
|
|
|
|
# Ideally, the schema should have this line otherwise any other properties
|
|
# present are allowed. There's a few common properties such as 'status' and
|
|
# 'pinctrl-*' which are added automatically by the tooling.
|
|
#
|
|
# This can't be used in cases where another schema is referenced
|
|
# (i.e. allOf: [{$ref: ...}]).
|
|
additionalProperties: false
|
|
|
|
examples:
|
|
# Examples are now compiled with dtc and validated against the schemas
|
|
#
|
|
# Examples have a default #address-cells and #size-cells value of 1. This can
|
|
# be overridden or an appropriate parent bus node should be shown (such as on
|
|
# i2c buses).
|
|
#
|
|
# Any includes used have to be explicitly included.
|
|
- |
|
|
node@1000 {
|
|
compatible = "vendor,soc4-ip", "vendor,soc1-ip";
|
|
reg = <0x1000 0x80>,
|
|
<0x3000 0x80>;
|
|
reg-names = "core", "aux";
|
|
interrupts = <10>;
|
|
interrupt-controller;
|
|
};
|