refactor(power): generalise LM51xx regulator driver#471
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Generalise the super-cap charger regulator driver into a reusable tfh,lm51xx driver for all LM51xx-family boost converters on the board: - Super-cap charger (both boards) - PVCC supply with optional mode GPIO (both boards) - 12V-caps supply (Diamond only) The driver supports an optional mode-gpios property for the FPWM/diode-emulation select pin, configured as GPIO_OUTPUT_INACTIVE at init. The optics code continues to toggle the mode pin at runtime via its gpio_dt_spec, now referenced from the pvcc_regulator DT node. Signed-off-by: Cyril Fougeray <cyril.fougeray@toolsforhumanity.com> Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Replace raw GPIO control of the super-cap charger (LM5176/LM5144) with a proper Zephyr regulator driver using regulator_enable()/disable().
The custom tfh,super-cap-charger driver uses GPIO_OUTPUT_INACTIVE at init (unlike regulator-fixed which uses GPIO_OUTPUT), preventing PCA95xx GPIO expanders from briefly enabling the charger at boot due to their default output register being all-1s.