diff --git a/drivers/iio/adc/ad7944.c b/drivers/iio/adc/ad7944.c
index d5ec6b5a41c7..9aa3e98cd75c 100644
--- a/drivers/iio/adc/ad7944.c
+++ b/drivers/iio/adc/ad7944.c
@@ -366,7 +366,6 @@ static int ad7944_probe(struct spi_device *spi)
 	struct ad7944_adc *adc;
 	bool have_refin = false;
 	struct regulator *ref;
-	const char *str_val;
 	int ret;
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
@@ -382,17 +381,17 @@ static int ad7944_probe(struct spi_device *spi)
 
 	adc->timing_spec = chip_info->timing_spec;
 
-	if (device_property_read_string(dev, "adi,spi-mode", &str_val) == 0) {
-		ret = sysfs_match_string(ad7944_spi_modes, str_val);
-		if (ret < 0)
-			return dev_err_probe(dev, -EINVAL,
-					     "unsupported adi,spi-mode\n");
-
-		adc->spi_mode = ret;
-	} else {
-		/* absence of adi,spi-mode property means default mode */
+	ret = device_property_match_property_string(dev, "adi,spi-mode",
+						    ad7944_spi_modes,
+						    ARRAY_SIZE(ad7944_spi_modes));
+	/* absence of adi,spi-mode property means default mode */
+	if (ret == -EINVAL)
 		adc->spi_mode = AD7944_SPI_MODE_DEFAULT;
-	}
+	else if (ret < 0)
+		return dev_err_probe(dev, ret,
+				     "getting adi,spi-mode property failed\n");
+	else
+		adc->spi_mode = ret;
 
 	if (adc->spi_mode == AD7944_SPI_MODE_CHAIN)
 		return dev_err_probe(dev, -EINVAL,