dt: bindings: ux500: Add documentation for PM domains

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/Documentation/devicetree/bindings/arm/ux500/power_domain.txt b/Documentation/devicetree/bindings/arm/ux500/power_domain.txt
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+* ST-Ericsson UX500 PM Domains
+
+UX500 supports multiple PM domains which are used to gate power to one or
+more peripherals on the SOC.
+
+The implementation of PM domains for UX500 are based upon the generic PM domain
+and use the corresponding DT bindings.
+
+==PM domain providers==
+
+Required properties:
+ - compatible: Must be "stericsson,ux500-pm-domains".
+ - #power-domain-cells : Number of cells in a power domain specifier, must be 1.
+
+Example:
+       pm_domains: pm_domains0 {
+               compatible = "stericsson,ux500-pm-domains";
+               #power-domain-cells = <1>;
+       };
+
+==PM domain consumers==
+
+Required properties:
+ - power-domains: A phandle and PM domain specifier. Below are the list of
+               valid specifiers:
+
+               Index   Specifier
+               -----   ---------
+               0       DOMAIN_VAPE
+
+Example:
+       sdi0_per1@80126000 {
+               compatible = "arm,pl18x", "arm,primecell";
+               power-domains = <&pm_domains DOMAIN_VAPE>
+       };