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If a power supply has a scope of "Device", then allow the power supply to indicate what device it actually powers. This is represented in the power supply's sysfs directory as a symlink named "powers", which points to the sysfs directory of the powered device. If the device has children, then the sub-devices are also powered by the same power supply. Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Richard Hughes <richard@hughsie.com>