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Commit dbe67543 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Kukjin Kim
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dt-bindings: document a note about power domain subdomains 



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: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Acked-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarKukjin Kim <kgene@kernel.org>
parent 9843a223

Documentation/devicetree/bindings/power/power_domain.txt

+29 −0
Original line number Diff line number Diff line
@@ -19,6 +19,16 @@ Required properties: 
   providing multiple PM domains (e.g. power controllers), but can be any value

   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:



	power: power-controller@12340000 {
@@ -30,6 +40,25 @@ Example: 
The node above defines a power controller that is a PM domain provider and

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==



Required properties: