From: Oleksii Moisieiev Oleksii_Moisieiev@epam.com
Introducing of the common device controller bindings for the controller provider and consumer devices. Those bindings are intended to allow divided system on chip into multiple domains, that can be used to configure hardware permissions.
Signed-off-by: Oleksii Moisieiev oleksii_moisieiev@epam.com [Gatien: Fix typos and YAML error] Signed-off-by: Gatien Chevallier gatien.chevallier@foss.st.com ---
Changes in V4: Corrected typos and YAML errors .../feature-domain-controller.yaml | 84 +++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 Documentation/devicetree/bindings/feature-controllers/feature-domain-controller.yaml
diff --git a/Documentation/devicetree/bindings/feature-controllers/feature-domain-controller.yaml b/Documentation/devicetree/bindings/feature-controllers/feature-domain-controller.yaml new file mode 100644 index 000000000000..57217da2d1cf --- /dev/null +++ b/Documentation/devicetree/bindings/feature-controllers/feature-domain-controller.yaml @@ -0,0 +1,84 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/feature-controllers/feature-domain-controller.... +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic Domain Controller + +maintainers: + - Oleksii Moisieiev oleksii_moisieiev@epam.com + +description: |+ + Common Feature Domains Controller properties + + Domain controllers allow to divided system on chip into multiple feature + domains that can be used to select by who hardware blocks could be accessed. + A feature domain could be a cluster of CPUs (or coprocessors), a range of + addresses or a group of hardware blocks. + + This device tree bindings can be used to bind feature domain consumer devices + with their feature domains provided by feature-domains controllers. + Feature omain controller provider can be represened by any node in the + device tree and can provide one or more configuration parameters, needed to + control parameters of the consumer device. A consumer node can refer to the + provider by phandle and a set of phandle arguments, specified by + '#feature-domain-cells' property in the device controller provider node. + + Device controllers are typically used to set the permissions of the hardware + block. The contents of the feature-domains configuration properties are + defined by the binding for the individual feature-domains controller device. + + Each node can be a consumer for the several providers. The first + configuration of 'feature-domains' or the one named 'default' is applied + before probing the device itself. + +# always select the core schema +select: true + +properties: + '#feature-domain-cells': + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Number of cells in a feature-domains controller specifier; + Can be any value as specified by device tree binding documentation + of a particular provider. + + feature-domain-controller: + description: + Indicates that the node is feature-domain-controller provider. + + feature-domain-names: + $ref: '/schemas/types.yaml#/definitions/string-array' + description: + A list of feature-domains names, sorted in the same order as + feature-domains entries. Consumer drivers will use feature-domain-names + to match with existing feature-domains entries. + + feature-domains: + $ref: "/schemas/types.yaml#/definitions/phandle-array" + description: + A list of feature-domains controller specifiers, as defined by the + bindings of the feature-domain-controller provider. + +additionalProperties: true + +examples: + - | + ctrl0: ctrl@100 { + feature-domain-controller; + reg = <0x100 0x10>; + #feature-domain-cells = <2>; + }; + + ctrl1: ctrl@110 { + feature-domain-controller; + reg = <0x110 0x10>; + #feature-domain-cells = <3>; + }; + + foo@0 { + reg = <0x0 0x1>; + feature-domains = <&ctrl0 1 2>, <&ctrl1 3 4 5>; + feature-domain-names = "default", "unbind"; + };