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| author | Stephan Olbrich <stephanolbrich@gmx.de> | 2016-02-14 11:04:29 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-02-15 21:45:47 +0100 |
| commit | e9dd4edcc98593bbcdffc0c4f37545b8fd0ad3ea (patch) | |
| tree | 69d6cc2f8d528c87b0828401659ad6ec3f751965 /drivers/spi/spi.c | |
| parent | spi: bcm2835aux: set up spi-mode before asserting cs-gpio (diff) | |
| download | linux-e9dd4edcc98593bbcdffc0c4f37545b8fd0ad3ea.tar.xz linux-e9dd4edcc98593bbcdffc0c4f37545b8fd0ad3ea.zip | |
spi: bcm2835aux: fix CPOL/CPHA setting
The auxiliary spi supports only CPHA=0 modes as the first bit is
always output to the pin before the first clock cycle. In CPHA=1
modes the first clock edge outputs the second bit hence the slave
can never read the first bit.
Also the CPHA registers switch between clocking data in/out on
rising/falling edge hence depend on the CPOL setting.
Signed-off-by: Stephan Olbrich <stephanolbrich@gmx.de>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi.c')
0 files changed, 0 insertions, 0 deletions