Add support for the Dallas DS1390/93/94 SPI RTC chip.
Signed-off-by: NMark Jackson <mpfj@mimc.co.uk>
Acked-by: NAlessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>