diff options
| author | Mike Frysinger <vapier@gentoo.org> | 2011-07-22 23:10:11 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2011-07-23 01:18:35 -0400 |
| commit | 10617340ce1491da7654d408d0d635ba98ef8350 (patch) | |
| tree | cff62989a8d5c0d8b0961bdd96c5e07297261182 /Documentation/blackfin | |
| parent | 2b6678c552ea05e7732fa1486ae1f56cb4a45f47 (diff) | |
Blackfin: spi-docs: further clarify GPIO CS behavior with various modes
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'Documentation/blackfin')
| -rw-r--r-- | Documentation/blackfin/bfin-spi-notes.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/blackfin/bfin-spi-notes.txt b/Documentation/blackfin/bfin-spi-notes.txt index 556fa877f2e8..eae6eaf2a09d 100644 --- a/Documentation/blackfin/bfin-spi-notes.txt +++ b/Documentation/blackfin/bfin-spi-notes.txt | |||
| @@ -9,6 +9,8 @@ the entire SPI transfer. - And not just bits_per_word duration. | |||
| 9 | In most cases you can utilize SPI MODE_3 instead of MODE_0 to work-around this | 9 | In most cases you can utilize SPI MODE_3 instead of MODE_0 to work-around this |
| 10 | behavior. If your SPI slave device in question requires SPI MODE_0 or MODE_2 | 10 | behavior. If your SPI slave device in question requires SPI MODE_0 or MODE_2 |
| 11 | timing, you can utilize the GPIO controlled SPI Slave Select option instead. | 11 | timing, you can utilize the GPIO controlled SPI Slave Select option instead. |
| 12 | In this case, you should use GPIO based CS for all of your slaves and not just | ||
| 13 | the ones using mode 0 or 2 in order to guarantee correct CS toggling behavior. | ||
| 12 | 14 | ||
| 13 | You can even use the same pin whose peripheral role is a SSEL, | 15 | You can even use the same pin whose peripheral role is a SSEL, |
| 14 | but use it as a GPIO instead. | 16 | but use it as a GPIO instead. |