diff options
Diffstat (limited to 'drivers/spi/spi.c')
-rw-r--r-- | drivers/spi/spi.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 0276bc37e255..a525a3a848c1 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c | |||
@@ -607,8 +607,19 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master); | |||
607 | */ | 607 | */ |
608 | int spi_setup(struct spi_device *spi) | 608 | int spi_setup(struct spi_device *spi) |
609 | { | 609 | { |
610 | unsigned bad_bits; | ||
610 | int status; | 611 | int status; |
611 | 612 | ||
613 | /* help drivers fail *cleanly* when they need options | ||
614 | * that aren't supported with their current master | ||
615 | */ | ||
616 | bad_bits = spi->mode & ~spi->master->mode_bits; | ||
617 | if (bad_bits) { | ||
618 | dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n", | ||
619 | bad_bits); | ||
620 | return -EINVAL; | ||
621 | } | ||
622 | |||
612 | if (!spi->bits_per_word) | 623 | if (!spi->bits_per_word) |
613 | spi->bits_per_word = 8; | 624 | spi->bits_per_word = 8; |
614 | 625 | ||