[PATCH] drm/tegra: Fix regulator_get_optional() misuse

[Mark Brown]

On Tue, Nov 05, 2019 at 02:15:11PM +0100, Thierry Reding wrote:

> It is in fact optional in this case. This code remains solely for
> backwards compatibility with old DTBs because back at the time the VDD
> supply was associated with the DPAUX block where it should've really
> been associated with the eDP panel.

That should really have some documentation, and in any case would be
better implemented by using the supply_alias feature to remap the supply
to the panel device so that we're using the same code path when actually
managing the regulator either way.
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