diff options
| author | David Brownell <david-b@pacbell.net> | 2007-07-17 07:04:02 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 13:23:04 -0400 |
| commit | dccd573bb02aa011a4a7146c02c409ac0bd722a0 (patch) | |
| tree | 743eeca4fbbea8272ca4f341b806d776e404d704 /drivers/spi/atmel_spi.c | |
| parent | ff294cba8a62fa8334b88692da6d48683900f015 (diff) | |
SPI controller drivers: check for unsupported modes
Minor SPI controller driver updates: make the setup() methods reject
spi->mode bits they don't support, by masking aginst the inverse of bits
they *do* support. This insures against misbehavior later when new mode
bits get added.
Most controllers can't support SPI_LSB_FIRST; more handle SPI_CS_HIGH.
Support for all four SPI clock/transfer modes is routine.
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/atmel_spi.c')
| -rw-r--r-- | drivers/spi/atmel_spi.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c index 8b2601de3630..7524a84bdd50 100644 --- a/drivers/spi/atmel_spi.c +++ b/drivers/spi/atmel_spi.c | |||
| @@ -350,6 +350,7 @@ atmel_spi_interrupt(int irq, void *dev_id) | |||
| 350 | return ret; | 350 | return ret; |
| 351 | } | 351 | } |
| 352 | 352 | ||
| 353 | /* the spi->mode bits understood by this driver: */ | ||
| 353 | #define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) | 354 | #define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) |
| 354 | 355 | ||
| 355 | static int atmel_spi_setup(struct spi_device *spi) | 356 | static int atmel_spi_setup(struct spi_device *spi) |