twl-regulator: Add turnon delay to reg_enable
This change implements a basic turnon delay in the regulator enable function to make it less probable that reg_enable returns before the regulator output is at target level Signed-off-by: NJuha Keski-Saari <ext-juha.1.keski-saari@nokia.com> Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>
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