[PATCH v3] spi: bitbang: only toggle bitchanges

[Mark Brown]

On Sat, Apr 18, 2015 at 03:18:49PM +0200, Marc Kleine-Budde wrote:

> IIRC we had a reduction of about 30% when programming an FPGA via SPI.
> But Michael can give you the exact numbers. 

OK, that's definitely worth writing home about - putting that in the
commit message would have helped a lot!  I've applied the patch.
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