[PATCH v2 2/3] iio: accel: adxl345: Add spi-3wire feature

[Lothar Rubusch <l.rubusch@gmail.com>]

Add the spi-3wire feature to the iio driver. Pass a
function pointer to configure the device if 3-wire
was configured in the device-tree.

Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
---
 drivers/iio/accel/adxl345_spi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c
index c26bac462..aea368895 100644
--- a/drivers/iio/accel/adxl345_spi.c
+++ b/drivers/iio/accel/adxl345_spi.c
@@ -20,6 +20,16 @@ static const struct regmap_config adxl345_spi_regmap_config = {
 	.read_flag_mask = BIT(7) | BIT(6),
 };
 
+static int adxl345_spi_setup(struct device *dev, struct regmap *regmap)
+{
+	struct spi_device *spi = container_of(dev, struct spi_device, dev);
+
+	if (spi->mode & SPI_3WIRE)
+		return regmap_write(regmap, ADXL345_REG_DATA_FORMAT,
+			    ADXL345_DATA_FORMAT_SPI);
+	return 0;
+}
+
 static int adxl345_spi_probe(struct spi_device *spi)
 {
 	const struct adxl345_chip_info *chip_data;
@@ -39,7 +49,7 @@ static int adxl345_spi_probe(struct spi_device *spi)
 	if (IS_ERR(regmap))
 		return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n");
 
-	return adxl345_core_probe(&spi->dev, regmap, chip_data, NULL);
+	return adxl345_core_probe(&spi->dev, regmap, chip_data, &adxl345_spi_setup);
 }
 
 static const struct spi_device_id adxl345_spi_id[] = {
-- 
2.25.1