From: David Brownell <dbrownell@users.sourceforge.net>
Date: Tue, 21 Apr 2009 19:24:49 +0000 (-0700)
Subject: spi: documentation: emphasise spi_master.setup() semantics
X-Git-Tag: v2.6.30-rc3~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e538aaf50ae782a890cbc02c27950448d8193e1;p=pandora-kernel.git

spi: documentation: emphasise spi_setup() semantics

This is a doc-only patch which I hope will reduce the number of
spi_master controller driver patches starting out with a common
implementation bug.

(As in: almost every spi_master driver I see starts out with its
version of this bug.  Sigh.)

It just re-emphasizes that the setup() method may be called for one
device while a transfer is active on another ...  which means that most
driver implementations shouldn't touch any registers.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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