From 2841a5fc375e9c573d10b82db30fa8a4cc25301c Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@linaro.org>
Date: Sat, 5 Oct 2013 00:23:12 +0100
Subject: [PATCH] spi: Provide per-message prepare and unprepare operations

Many SPI drivers perform setup and tear down on every message, usually
doing things like DMA mapping the message. Provide hooks for them to use
to provide such operations.

This is of limited value for drivers that implement transfer_one_message()
but will be of much greater utility with future factoring out of standard
implementations of that function.

Signed-off-by: Mark Brown <broonie@linaro.org>
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