The Linux SPI subsystem is not designed for things like this.
It's based on workqueues.
http://www.linuxjournal.com/article/6916Use the OMAP3 McBSP controller instead.
McBSP3 can be mux'd out pins 27-30 on most of the expansion boards (gpio
144-147)
I've used it in a number of projects and you can get very good,
deterministic performance from it.
It can do 'SPI' protocol, but with only one 'slave' device.
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