* Samsung Exynos Power Domains

Exynos processors include support for multiple power domains which are used
to gate power to one or more peripherals on the processor.

Required Properties:
- compatible: should be one of the following.
    * samsung,exynos4210-pd - for exynos4210 type power domain.
- reg: physical base address of the controller and length of memory mapped
    region.

Node of a device using power domains must have a samsung,power-domain property
defined with a phandle to respective power domain.

Example:

        lcd0: power-domain-lcd0 {
                compatible = "samsung,exynos4210-pd";
                reg = <0x10023C00 0x10>;
        };

Example of the node using power domain:

        node {
                /* ... */
                samsung,power-domain = <&lcd0>;
                /* ... */
        };