ed054565312ecdf0a55a5333c64
author Axel Lin <axel.lin@gmail.com> 1334573063 +0800
committer Mark Brown <broonie@opensource.wolfsonmicro.com> 1334602508 +0100

regulator: core: Add checking set_mode callback in regulator_set_optimum_mode

regulator_set_optimum_mode needs set_mode to properly work.
Add checking for set_mode callback in case it may be not implemented.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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