spi: Use bitfields for multiple data lines

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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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Mark Brown 2014-01-10 17:09:53 +00:00

parent a89e2d2754

commit d3fbd45701

1 changed files with 2 additions and 2 deletions

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include/linux/spi/spi.h

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