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Userspace wants to now about the used power supply extensions, for example to handle a device extended by a certain extension differently or to discover information about the extending device. Add a sysfs directory to the power supply device. This directory contains links which are named after the used extension and point to the device implementing that extension. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Reviewed-by: Armin Wolf <W_Armin@gmx.de> Link: https://lore.kernel.org/r/20241211-power-supply-extensions-v6-4-9d9dc3f3d387@weissschuh.net Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>