Patch merged into coreboot/master: a3565ae spi_flash: document expected return values

the following patch was just integrated into master:
commit a3565ae7c6046cafc0fd1361a711c1f8468d0eec
Author: Aaron Durbin 
Date:   Thu May 14 14:46:59 2015 -0500

spi_flash: document expected return values

The spi_flash API did not have any of its callbacks
    documented. Do that so that people don't have to go
    into the guts of an implementation to figure out the
    proper expectations.

Change-Id: I55a0515445cab3697813d88373ee413f30b557b5
    Signed-off-by: Aaron Durbin 
    Reviewed-on: http://review.coreboot.org/10206
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10206 for details.

-gerrit