From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed, 3 Dec 2014 06:56:19 +0000 (+0100)
Subject: spi: fsl-espi: add (un)prepare_transfer_hardware calls to save power if SPI is not... 
X-Git-Tag: omap-for-v3.19/fixes-rc1~131^2~2^3~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75506d0e0084ee7f074be3c5da6d5de98ce347b6;p=pandora-kernel.git

spi: fsl-espi: add (un)prepare_transfer_hardware calls to save power if SPI is not in use

Use (un)prepare_transfer_hardware calls to set fsl-espi to
low-power idle if not in use. Reference manual states:

"The eSPI is in a idle state and consumes minimal power.
The eSPI BRG is not functioning and the input clock is disabled"

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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