MMC core: limit minimum initialization frequency to 400kHz

Some controllers allow a much lower frequency than 400kHz.
Keep the minimum frequency within sensible limits.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2009-04-09 08:32:02 +02:00 • committed by Pierre Ossman
commit 8dfd0374be