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1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/access-controllers/access-controllers.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: Generic Domain Access Controllers8 9maintainers:10 - Oleksii Moisieiev <oleksii_moisieiev@epam.com>11 12description: |+13 Common access controllers properties14 15 Access controllers are in charge of stating which of the hardware blocks under16 their responsibility (their domain) can be accesssed by which compartment. A17 compartment can be a cluster of CPUs (or coprocessors), a range of addresses18 or a group of hardware blocks. An access controller's domain is the set of19 resources covered by the access controller.20 21 This device tree binding can be used to bind devices to their access22 controller provided by access-controllers property. In this case, the device23 is a consumer and the access controller is the provider.24 25 An access controller can be represented by any node in the device tree and26 can provide one or more configuration parameters, needed to control parameters27 of the consumer device. A consumer node can refer to the provider by phandle28 and a set of phandle arguments, specified by '#access-controller-cells'29 property in the access controller node.30 31 Access controllers are typically used to set/read the permissions of a32 hardware block and grant access to it. Any of which depends on the access33 controller. The capabilities of each access controller are defined by the34 binding of the access controller device.35 36 Each node can be a consumer for the several access controllers.37 38# always select the core schema39select: true40 41properties:42 "#access-controller-cells":43 description:44 Number of cells in an access-controllers specifier;45 Can be any value as specified by device tree binding documentation46 of a particular provider. The node is an access controller.47 48 access-controller-names:49 $ref: /schemas/types.yaml#/definitions/string-array50 description:51 A list of access-controllers names, sorted in the same order as52 access-controllers entries. Consumer drivers will use53 access-controller-names to match with existing access-controllers entries.54 55 access-controllers:56 $ref: /schemas/types.yaml#/definitions/phandle-array57 description:58 A list of access controller specifiers, as defined by the59 bindings of the access-controllers provider.60 61additionalProperties: true62 63examples:64 - |65 clock_controller: access-controllers@50000 {66 reg = <0x50000 0x400>;67 #access-controller-cells = <2>;68 };69 70 bus_controller: bus@60000 {71 reg = <0x60000 0x10000>;72 #address-cells = <1>;73 #size-cells = <1>;74 ranges;75 #access-controller-cells = <3>;76 77 uart4: serial@60100 {78 reg = <0x60100 0x400>;79 clocks = <&clk_serial>;80 access-controllers = <&clock_controller 1 2>,81 <&bus_controller 1 3 5>;82 access-controller-names = "clock", "bus";83 };84 };85