diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c
index 112e2b7b5bc4..5c2fcd7d2def 100644
--- a/drivers/staging/iio/adc/ad7793.c
+++ b/drivers/staging/iio/adc/ad7793.c
@@ -44,7 +44,6 @@ struct ad7793_state {
 	struct iio_trigger		*trig;
 	const struct ad7793_chip_info	*chip_info;
 	struct regulator		*reg;
-	struct ad7793_platform_data	*pdata;
 	wait_queue_head_t		wq_data_avail;
 	bool				done;
 	bool				irq_dis;
@@ -253,7 +252,8 @@ out:
 	return ret;
 }
 
-static int ad7793_setup(struct ad7793_state *st)
+static int ad7793_setup(struct ad7793_state *st,
+	const struct ad7793_platform_data *pdata)
 {
 	int i, ret = -1;
 	unsigned long long scale_uv;
@@ -277,9 +277,9 @@ static int ad7793_setup(struct ad7793_state *st)
 		goto out;
 	}
 
-	st->mode  = (st->pdata->mode & ~AD7793_MODE_SEL(-1)) |
+	st->mode  = (pdata->mode & ~AD7793_MODE_SEL(-1)) |
 			AD7793_MODE_SEL(AD7793_MODE_IDLE);
-	st->conf  = st->pdata->conf & ~AD7793_CONF_CHAN(-1);
+	st->conf  = pdata->conf & ~AD7793_CONF_CHAN(-1);
 
 	ret = ad7793_write_reg(st, AD7793_REG_MODE, sizeof(st->mode), st->mode);
 	if (ret)
@@ -290,7 +290,7 @@ static int ad7793_setup(struct ad7793_state *st)
 		goto out;
 
 	ret = ad7793_write_reg(st, AD7793_REG_IO,
-			       sizeof(st->pdata->io), st->pdata->io);
+			       sizeof(pdata->io), pdata->io);
 	if (ret)
 		goto out;
 
@@ -882,7 +882,7 @@ static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
 
 static int __devinit ad7793_probe(struct spi_device *spi)
 {
-	struct ad7793_platform_data *pdata = spi->dev.platform_data;
+	const struct ad7793_platform_data *pdata = spi->dev.platform_data;
 	struct ad7793_state *st;
 	struct iio_dev *indio_dev;
 	int ret, voltage_uv = 0;
@@ -915,8 +915,6 @@ static int __devinit ad7793_probe(struct spi_device *spi)
 	st->chip_info =
 		&ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data];
 
-	st->pdata = pdata;
-
 	if (pdata && pdata->vref_mv)
 		st->int_vref_mv = pdata->vref_mv;
 	else if (voltage_uv)
@@ -944,7 +942,7 @@ static int __devinit ad7793_probe(struct spi_device *spi)
 	if (ret)
 		goto error_unreg_ring;
 
-	ret = ad7793_setup(st);
+	ret = ad7793_setup(st, pdata);
 	if (ret)
 		goto error_remove_trigger;