regulator: mt6397: Document valid modes

Document valid mode values for BUCK regulators.

Signed-off-by: Anand K Mistry <amistry@google.com>
Link: https://lore.kernel.org/r/20200702162231.v2.2.I0a814b246cfe47f8dd1e25553ee881cbcfd0d8eb@changeid
Signed-off-by: Mark Brown <broonie@kernel.org>
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Anand K Mistry 2020-07-02 16:23:18 +10:00 • committed by Mark Brown
commit 347f12d573
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