dt/bindings / PM/Domains: Update binding for PM domain idle states
Update DT bindings to describe idle states of PM domains. This patch is based on the original patch by Marc Titinger. Signed-off-by: Marc Titinger <mtitinger+renesas@baylibre.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -29,6 +29,15 @@ Optional properties:
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specified by this binding. More details about power domain specifier are
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specified by this binding. More details about power domain specifier are
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available in the next section.
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available in the next section.
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- domain-idle-states : A phandle of an idle-state that shall be soaked into a
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generic domain power state. The idle state definitions are
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compatible with arm,idle-state specified in [1].
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The domain-idle-state property reflects the idle state of this PM domain and
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not the idle states of the devices or sub-domains in the PM domain. Devices
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and sub-domains have their own idle-states independent of the parent
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domain's idle states. In the absence of this property, the domain would be
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considered as capable of being powered-on or powered-off.
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Example:
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Example:
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power: power-controller@12340000 {
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power: power-controller@12340000 {
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@ -59,6 +68,38 @@ 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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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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domain provided by the 'parent' power controller.
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Example 3:
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parent: 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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child: power-controller@12341000 {
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compatible = "foo,power-controller";
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reg = <0x12341000 0x1000>;
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power-domains = <&parent 0>;
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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_RET: state@0 {
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compatible = "arm,idle-state";
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reg = <0x0>;
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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: state@1 {
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compatible = "arm,idle-state";
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reg = <0x1>;
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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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==PM domain consumers==
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==PM domain consumers==
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Required properties:
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Required properties:
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@ -76,3 +117,5 @@ Example:
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The node above defines a typical PM domain consumer device, which is located
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The node above defines a typical PM domain consumer device, which is located
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inside a PM domain with index 0 of a power controller represented by a node
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inside a PM domain with index 0 of a power controller represented by a node
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with the label "power".
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with the label "power".
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[1]. Documentation/devicetree/bindings/arm/idle-states.txt
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