diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi_bfin5xx.c | 12 |
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; |