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Diffstat (limited to 'Documentation/devicetree/bindings/power/power-domain.yaml')
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diff --git a/Documentation/devicetree/bindings/power/power-domain.yaml b/Documentation/devicetree/bindings/power/power-domain.yaml new file mode 100644 index 000000000000..455b573293ae --- /dev/null +++ b/Documentation/devicetree/bindings/power/power-domain.yaml @@ -0,0 +1,133 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/power/power-domain.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic PM domains + +maintainers: + - Rafael J. Wysocki <rjw@rjwysocki.net> + - Kevin Hilman <khilman@kernel.org> + - Ulf Hansson <ulf.hansson@linaro.org> + +description: |+ + System on chip designs are often divided into multiple PM domains that can be + used for power gating of selected IP blocks for power saving by reduced leakage + current. + + This device tree binding can be used to bind PM domain consumer devices with + their PM domains provided by PM domain providers. A PM domain provider can be + represented by any node in the device tree and can provide one or more PM + domains. A consumer node can refer to the provider by a phandle and a set of + phandle arguments (so called PM domain specifiers) of length specified by the + \#power-domain-cells property in the PM domain provider node. + +properties: + $nodename: + pattern: "^(power-controller|power-domain)(@.*)?$" + + domain-idle-states: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: + A phandle of an idle-state that shall be soaked into a generic domain + power state. The idle state definitions are compatible with + domain-idle-state specified in + Documentation/devicetree/bindings/power/domain-idle-state.txt + phandles that are not compatible with domain-idle-state will be ignored. + The domain-idle-state property reflects the idle state of this PM domain + and not the idle states of the devices or sub-domains in the PM domain. + Devices and sub-domains have their own idle-states independent + of the parent domain's idle states. In the absence of this property, + the domain would be considered as capable of being powered-on + or powered-off. + + operating-points-v2: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: + Phandles to the OPP tables of power domains provided by a power domain + provider. If the provider provides a single power domain only or all + the power domains provided by the provider have identical OPP tables, + then this shall contain a single phandle. Refer to ../opp/opp.txt + for more information. + + "#power-domain-cells": + description: + Number of cells in a PM domain specifier. Typically 0 for nodes + representing a single PM domain and 1 for nodes providing multiple PM + domains (e.g. power controllers), but can be any value as specified + by device tree binding documentation of particular provider. + + power-domains: + description: + A phandle and PM domain specifier as defined by bindings of the power + controller specified by phandle. Some power domains might be powered + from another power domain (or have other hardware specific + dependencies). For representing such dependency a standard PM domain + consumer binding is used. When provided, all domains created + by the given provider should be subdomains of the domain specified + by this binding. + +required: + - "#power-domain-cells" + +examples: + - | + power: power-controller@12340000 { + compatible = "foo,power-controller"; + reg = <0x12340000 0x1000>; + #power-domain-cells = <1>; + }; + + // The node above defines a power controller that is a PM domain provider and + // expects one cell as its phandle argument. + + - | + parent2: power-controller@12340000 { + compatible = "foo,power-controller"; + reg = <0x12340000 0x1000>; + #power-domain-cells = <1>; + }; + + child2: power-controller@12341000 { + compatible = "foo,power-controller"; + reg = <0x12341000 0x1000>; + power-domains = <&parent2 0>; + #power-domain-cells = <1>; + }; + + // The nodes above define two power controllers: 'parent' and 'child'. + // Domains created by the 'child' power controller are subdomains of '0' power + // domain provided by the 'parent' power controller. + + - | + parent3: power-controller@12340000 { + compatible = "foo,power-controller"; + reg = <0x12340000 0x1000>; + #power-domain-cells = <0>; + domain-idle-states = <&DOMAIN_RET>, <&DOMAIN_PWR_DN>; + }; + + child3: power-controller@12341000 { + compatible = "foo,power-controller"; + reg = <0x12341000 0x1000>; + power-domains = <&parent3>; + #power-domain-cells = <0>; + domain-idle-states = <&DOMAIN_PWR_DN>; + }; + + DOMAIN_RET: state@0 { + compatible = "domain-idle-state"; + reg = <0x0 0x0>; + entry-latency-us = <1000>; + exit-latency-us = <2000>; + min-residency-us = <10000>; + }; + + DOMAIN_PWR_DN: state@1 { + compatible = "domain-idle-state"; + reg = <0x1 0x0>; + entry-latency-us = <5000>; + exit-latency-us = <8000>; + min-residency-us = <7000>; + }; |