regmap: Add missing comments about struct regmap_bus

There are some fields of this struct undocumented or old. This patch
updates the missing comments.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Markus Pargmann 2015-08-21 10:26:40 +02:00 • committed by Mark Brown
commit c5f58f2d70