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authorMike Frysinger <michael.frysinger@analog.com>2007-12-04 23:45:14 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-12-05 09:21:19 -0800
commit2ed355165ff4ec834a75770f2a15dc87f5e06088 (patch)
tree9d409b8a624916225f07791d322dd6ca9eea4521 /drivers/spi
parentfad91c890909aabab0d9858d50f3c8394ee16b21 (diff)
spi: spi_bfin, don't bypass spi framework
Prevent people from setting bits in ctl_reg that the SPI framework already handles, hopefully we can one day drop ctl_reg completely Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> 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 'drivers/spi')
-rw-r--r--drivers/spi/spi_bfin5xx.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index c2d51cf3c63..8e4ea8906dc 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -998,6 +998,18 @@ static int setup(struct spi_device *spi)
/* chip_info isn't always needed */
if (chip_info) {
+ /* Make sure people stop trying to set fields via ctl_reg
+ * when they should actually be using common SPI framework.
+ * Currently we let through: WOM EMISO PSSE GM SZ TIMOD.
+ * Not sure if a user actually needs/uses any of these,
+ * but let's assume (for now) they do.
+ */
+ if (chip_info->ctl_reg & (SPE|MSTR|CPOL|CPHA|LSBF|SIZE)) {
+ dev_err(&spi->dev, "do not set bits in ctl_reg "
+ "that the SPI framework manages\n");
+ return -EINVAL;
+ }
+
chip->enable_dma = chip_info->enable_dma != 0
&& drv_data->master_info->enable_dma;
chip->ctl_reg = chip_info->ctl_reg;