From: Mark Brown <broonie@linaro.org>
Date: Fri, 10 Jan 2014 17:09:53 +0000 (+0000)
Subject: spi: Use bitfields for multiple data lines
X-Git-Tag: v3.14-rc1~91^2~6^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d3fbd457013c0f6d96de461ce0a9cb1f8b73cd0b;p=pandora-kernel.git

spi: Use bitfields for multiple data lines

Trent Piepho observed that since the current realistic maximum number of
data lines is four we can pack the spi_transfer struct more efficiently
if we use a bitfield for the number of bits, allowing the fields to fit
in a single byte along with cs_change.

If space becomes an issue further optimiation is possible by only using
the constants and packing the values chosen for them.

Reported-by: Trent Piepho <tpiepho@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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