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authorMarek Szyprowski <m.szyprowski@samsung.com>2015-02-04 23:44:15 +0900
committerKukjin Kim <kgene@kernel.org>2015-02-27 05:26:57 +0900
commitdbe675433df3966cb4d24e80670a3134ab8757ee (patch)
tree0d0ad911c0f18c33e2019cd876487ddcc1609cf8 /Documentation
parent9843a2236003e343b4c0674d49c2700d505c9287 (diff)
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: 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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/power/power_domain.txt29
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
index 98c16672ab5f..0f8ed3710c66 100644
--- a/Documentation/devicetree/bindings/power/power_domain.txt
+++ b/Documentation/devicetree/bindings/power/power_domain.txt
@@ -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: