spi: fsl-spi: Convert to let spi core validate xfer->bits_per_word

Set bits_per_word_mask so spi core will reject transfers that attempt to use
an unsupported bits_per_word value.

fsl_spi_grlib_probe() may update mpc8xxx_spi->max_bits_per_word setting.
So set master->bits_per_word_mask after fsl_spi_grlib_probe().

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 4 insertions, 6 deletions

diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 4dcb2929c01f..f35488ed62a9 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -239,12 +239,6 @@ static int fsl_spi_setup_transfer(struct spi_device *spi,
         if (!bits_per_word)
                 bits_per_word = spi->bits_per_word;
 
-        /* Make sure its a bit width we support [4..16, 32] */
-        if ((bits_per_word < 4)
-            || ((bits_per_word > 16) && (bits_per_word != 32))
-            || (bits_per_word > mpc8xxx_spi->max_bits_per_word))
-                return -EINVAL;
-
         if (!hz)
                 hz = spi->max_speed_hz;
 
@@ -651,6 +645,10 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
         if (mpc8xxx_spi->type == TYPE_GRLIB)
                 fsl_spi_grlib_probe(dev);
 
+        master->bits_per_word_mask =
+                (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)) &
+                SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word);
+
         if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
                 mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;