Allows to enable/disable attached regulators from userspace, i.e. by simply writing value to a sysfs exported state file. Useful in case of USB port VBUS toggled by GPIO. Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com> Link: https://patchwork.ozlabs.org/project/openwrt/patch/20250529202033.28250-1-tmn505@terefe.re/ Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>