Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/Documentation/devicetree/bindings/example-schema.yaml b/Documentation/devicetree/bindings/example-schema.yaml
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+# SPDX-License-Identifier: (GPL-2.0 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 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
+
+ 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.
+
+ 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 is 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 ]
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - interrupt-controller
+
+examples:
+ # Examples are now compiled with dtc
+ - |
+ node@1000 {
+ compatible = "vendor,soc4-ip", "vendor,soc1-ip";
+ reg = <0x1000 0x80>,
+ <0x3000 0x80>;
+ reg-names = "core", "aux";
+ interrupts = <10>;
+ interrupt-controller;
+ };