diff options
Diffstat (limited to 'drivers/spi/au1550_spi.c')
| -rw-r--r-- | drivers/spi/au1550_spi.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/spi/au1550_spi.c b/drivers/spi/au1550_spi.c index ae2b1af0dba..c47a650183a 100644 --- a/drivers/spi/au1550_spi.c +++ b/drivers/spi/au1550_spi.c @@ -280,6 +280,9 @@ static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t) return 0; } +/* the spi->mode bits understood by this driver: */ +#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST) + static int au1550_spi_setup(struct spi_device *spi) { struct au1550_spi *hw = spi_master_get_devdata(spi->master); @@ -292,6 +295,12 @@ static int au1550_spi_setup(struct spi_device *spi) return -EINVAL; } + if (spi->mode & ~MODEBITS) { + dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n", + spi->mode & ~MODEBITS); + return -EINVAL; + } + if (spi->max_speed_hz == 0) spi->max_speed_hz = hw->freq_max; if (spi->max_speed_hz > hw->freq_max |