tree a6d8aabc4b3068c3679630f318a1706044c195b1
parent b687d2a8f8d46921ac5e80bf77967688afce68e2
author Atsushi Nemoto <anemo@mba.ocn.ne.jp> 1209374059 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1209398311 -0700

atmel_spi: support zero length transfer

A spi transfer with zero length is not invalid.  For example, such
transfer (len == 0 && delay_usecs != 0) can be used to achieve delay
before first CLK edge after chipselect assertion.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>