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Fairchild FAN53555 and its clone from Rockchip, Silergy and TCS support two modes of operation: - Auto-PFM: Allow automatic PFM during light load (default mode) - Forced PWM Some boards require forced PWM mode to keep the supply ripple within acceptable limits under light load conditions. Regulator mode indexes are starting from 1 to keep backward compatibility with existing device trees Signed-off-by: Victor Krawiec <victor.krawiec@arturia.com> Link: https://patch.msgid.link/20260723094001.120264-2-victor.krawiec@arturia.com Signed-off-by: Mark Brown <broonie@kernel.org>