From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sven Schwermer <sven@svenschwermer.de>
Date: Fri, 31 May 2019 10:29:34 +0200
Subject: [U-Boot] [PATCH] regulator: Allow autosetting fixed regulators
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> For fixed regulator, will min_uV/max_uV be set to value other
> than -ENODATA? I think no.

I see this commonly done (see Linux device trees as well as the u-boot device trees) and the kernel documentation seems to encourage it:
https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/fixed-regulator.txt <https://www.kernel.org/doc/Documentation/devicetree/bindings/regulator/fixed-regulator.txt>

Sven