From: Mike Frysinger 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 Signed-off-by: Bryan Wu Signed-off-by: David Brownell Signed-off-by: Andrew Morton --- drivers/spi/spi_bfin5xx.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff -puN drivers/spi/spi_bfin5xx.c~spi-spi_bfin-dont-bypass-spi-framework drivers/spi/spi_bfin5xx.c --- a/drivers/spi/spi_bfin5xx.c~spi-spi_bfin-dont-bypass-spi-framework +++ a/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; _