On Thu, Nov 22, 2018 at 04:32:41PM +0100, Maxime Ripard wrote: > On Thu, Nov 22, 2018 at 06:23:18PM +0800, Chen-Yu Tsai wrote: > > +- cpvdd-supply: Regulator supply for the headphone amplifier > I guess we should make this optional, since even if it's missing, it's > going to create a dummy regulator. and that allows to have backward > compatibility. Regulators should never be marked as optional unless they can be physically absent. It is true that Linux has code to handle partially defined device trees but we shouldn't rely on other OSs having similar code and it's better practice to have board device trees be fully specified, it means that if we need the regulator information for some future thing it's more likely to be there and it's less likely that bugs which do things like cause the regulator to be powered off incorrectly will be introduced in future.
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