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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>
hifive-unleashed-5.1
Lina Iyer 2016-10-14 10:47:53 -07:00 committed by Rafael J. Wysocki
parent 0c9b694a8a
commit 70bb510e42
1 changed files with 43 additions and 0 deletions
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43
Documentation/devicetree/bindings/power/power_domain.txt
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@ -29,6 +29,15 @@ Optional properties:
specified by this binding. More details about power domain specifier are
available in the next section.
- domain-idle-states : A phandle of an idle-state that shall be soaked into a
generic domain power state. The idle state definitions are
compatible with arm,idle-state specified in [1].
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.
Example:
power: power-controller@12340000 {
@ -59,6 +68,38 @@ 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.
Example 3:
parent: power-controller@12340000 {
compatible = "foo,power-controller";
reg = <0x12340000 0x1000>;
#power-domain-cells = <0>;
domain-idle-states = <&DOMAIN_RET>, <&DOMAIN_PWR_DN>;
};
child: power-controller@12341000 {
compatible = "foo,power-controller";
reg = <0x12341000 0x1000>;
power-domains = <&parent 0>;
#power-domain-cells = <0>;
domain-idle-states = <&DOMAIN_PWR_DN>;
};
DOMAIN_RET: state@0 {
compatible = "arm,idle-state";
reg = <0x0>;
entry-latency-us = <1000>;
exit-latency-us = <2000>;
min-residency-us = <10000>;
};
DOMAIN_PWR_DN: state@1 {
compatible = "arm,idle-state";
reg = <0x1>;
entry-latency-us = <5000>;
exit-latency-us = <8000>;
min-residency-us = <7000>;
};
==PM domain consumers==
Required properties:
@ -76,3 +117,5 @@ Example:
The node above defines a typical PM domain consumer device, which is located
inside a PM domain with index 0 of a power controller represented by a node
with the label "power".
[1]. Documentation/devicetree/bindings/arm/idle-states.txt