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dt-bindings: document a note about power domain subdomains

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This patch adds a note on defining subdomains to generic PM domain
binding documentation to let power domain providers use common approach
for defining power domain hierarchy.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Kukjin Kim <kgene@kernel.org>
This commit is contained in:
Marek Szyprowski
2015-02-04 23:44:15 +09:00
committed by Kukjin Kim
parent 9843a22360
commit dbe675433d
1 changed files with 29 additions and 0 deletions
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29
Documentation/devicetree/bindings/power/power_domain.txt
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@ -19,6 +19,16 @@ Required properties:
providing multiple PM domains (e.g. power controllers), but can be any value providing multiple PM domains (e.g. power controllers), but can be any value
as specified by device tree binding documentation of particular provider. as specified by device tree binding documentation of particular provider.
Optional properties:
- power-domains : 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. More details about power domain specifier are
available in the next section.
Example: Example:
power: power-controller@12340000 { power: power-controller@12340000 {
@ -30,6 +40,25 @@ Example:
The node above defines a power controller that is a PM domain provider and The node above defines a power controller that is a PM domain provider and
expects one cell as its phandle argument. expects one cell as its phandle argument.
Example 2:
parent: power-controller@12340000 {
compatible = "foo,power-controller";
reg = <0x12340000 0x1000>;
#power-domain-cells = <1>;
};
child: power-controller@12340000 {
compatible = "foo,power-controller";
reg = <0x12341000 0x1000>;
power-domains = <&parent 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.
==PM domain consumers== ==PM domain consumers==
Required properties: Required properties: