spi/s3c64xx: Convert to bits_per_word_mask

The core can do the validation for us.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

drivers/spi/spi-s3c64xx.c

@@ -911,15 +911,6 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
 
 	spin_unlock_irqrestore(&sdd->lock, flags);
 
-	if (spi->bits_per_word != 8
-			&& spi->bits_per_word != 16
-			&& spi->bits_per_word != 32) {
-		dev_err(&spi->dev, "setup: %dbits/wrd not supported!\n",
-							spi->bits_per_word);
-		err = -EINVAL;
-		goto setup_exit;
-	}
-
 	pm_runtime_get_sync(&sdd->pdev->dev);
 
 	/* Check if we can provide the requested rate */
@@ -1237,6 +1228,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
 	master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer;
 	master->num_chipselect = sci->num_cs;
 	master->dma_alignment = 8;
+	master->bits_per_word_mask = BIT(32 - 1) | BIT(16 - 1) | BIT(8 - 1);
 	/* the spi->mode bits understood by this driver: */
 	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;