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author | David Brownell <david-b@pacbell.net> | 2007-06-16 17:16:08 (GMT) |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-06-16 20:16:16 (GMT) |
commit | f5a9c77df45b113d21b64cbc2bf6c72a0da48998 (patch) | |
tree | c68315e2d5e3e3b8075bfbe01fab054efc1d9bf2 /arch/um/os-Linux | |
parent | ed45666271f4fafa95b9d8ad44050e9a9bd2376e (diff) | |
download | linux-f5a9c77df45b113d21b64cbc2bf6c72a0da48998.tar.xz |
spi doc updates
Update two points in the SPI interface documentation:
- Update description of the "chip stays selected after message ends"
mode. In some cases it's required for correctness; it isn't just a
performance tweak. (Yes: to use this mode on mult-device busses, another
programming interface will be needed. One draft has been circulated
already.)
- Clarify spi_setup(), highlighting that callers must ensure that no
requests are queued (can't change configuration except between I/Os), and
that the device must be deselected when this returns (which is a key part
of why it's called during device init).
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>
Diffstat (limited to 'arch/um/os-Linux')
0 files changed, 0 insertions, 0 deletions