doc: Add companion SPI message protocol doc
authorKeith Packard <keithp@keithp.com>
Fri, 13 Jan 2012 18:40:30 +0000 (10:40 -0800)
committerKeith Packard <keithp@keithp.com>
Sun, 3 Jun 2012 02:38:29 +0000 (19:38 -0700)
Signed-off-by: Keith Packard <keithp@keithp.com>

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