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Blackfin: spi-docs: further clarify GPIO CS behavior with various modes

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Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Mike Frysinger 2011-07-22 23:10:11 -04:00
parent 2b6678c552
commit 10617340ce
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Documentation/blackfin/bfin-spi-notes.txt
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@ -9,6 +9,8 @@ the entire SPI transfer. - And not just bits_per_word duration.
In most cases you can utilize SPI MODE_3 instead of MODE_0 to work-around this In most cases you can utilize SPI MODE_3 instead of MODE_0 to work-around this
behavior. If your SPI slave device in question requires SPI MODE_0 or MODE_2 behavior. If your SPI slave device in question requires SPI MODE_0 or MODE_2
timing, you can utilize the GPIO controlled SPI Slave Select option instead. timing, you can utilize the GPIO controlled SPI Slave Select option instead.
In this case, you should use GPIO based CS for all of your slaves and not just
the ones using mode 0 or 2 in order to guarantee correct CS toggling behavior.
You can even use the same pin whose peripheral role is a SSEL, You can even use the same pin whose peripheral role is a SSEL,
but use it as a GPIO instead. but use it as a GPIO instead.