From 75506d0e0084ee7f074be3c5da6d5de98ce347b6 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Wed, 3 Dec 2014 07:56:19 +0100
Subject: [PATCH] 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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