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