ata: ahci_imx: add disable for spread-spectrum
Spread-spectrum doesn't work with Cubox-i hardware, so we have to
disable this feature. Add a DT property so that platforms can
indicate that this feature should not be enabled.
Having it as a negative property keeps existing DT files working.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
(cherry picked from commit
a6e726244c78e04d0af754c625036be8f92a9afd)