Input: ad7879 - fix spi word size to 16 bit

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/ad7879-spi.c

@@ -134,13 +134,21 @@ static const struct ad7879_bus_ops ad7879_spi_bus_ops = {
 static int __devinit ad7879_spi_probe(struct spi_device *spi)
 {
 	struct ad7879 *ts;
+	int err;
 
 	/* don't exceed max specified SPI CLK frequency */
 	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
 		dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
 		return -EINVAL;
 	}
 
+	spi->bits_per_word = 16;
+	err = spi_setup(spi);
+	if (err) {
+	        dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n");
+	        return err;
+	}
+
 	ts = ad7879_probe(&spi->dev, AD7879_DEVID, spi->irq, &ad7879_spi_bus_ops);
 	if (IS_ERR(ts))
 		return PTR_ERR(ts);