Factor out some boilerplate code.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Acked-by: NMika Westerberg <mika.westerberg@iki.fi>
Acked-by: NAlexander Sverdlin <subaparts@yandex.ru>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>