tree e2ef80291f2ed0176e9d8330c0b698aae790ecd4
parent 1f14081d8b31b2780e2e6e2ae2766264e1f7d38b
author Stanislaw Gruszka <stf_xl@wp.pl> 1232056244 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1232066375 -0800

atmel_spi: allow transfer when max_speed_hz = 0

For some reason I have to slowdown clock to touchscreen device.

In atmel_spi_setup() there is comment that max_speed_hz == 0 means as slow
as possible and divider is set to maximum value.  But in
atmel_spi_transfer() function is check against not zero max_speed_hz with
EINVAL returned.

Probably driver should setup divider for each transfer based on
transfer->speed_hz value, but I think that would be not necessary overhead
as all used devices have constant clock.

Below patch works fine for me.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>