[PATCH AUTOSEL 5.3 72/89] iio: accel: adxl372: Perform a reset at start up

[Sasha Levin]

From: Stefan Popa <stefan.popa@xxxxxxxxxx>

[ Upstream commit d9a997bd4d762d5bd8cc548d762902f58b5e0a74 ]

We need to perform a reset a start up to make sure that the chip is in a
consistent state. This reset also disables all the interrupts which
should only be enabled together with the iio buffer. Not doing this, was
sometimes causing unwanted interrupts to trigger.

Signed-off-by: Stefan Popa <stefan.popa@xxxxxxxxxx>
Fixes: f4f55ce38e5f ("iio:adxl372: Add FIFO and interrupts support")
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/iio/accel/adxl372.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
index fbad4b45fe42d..67b8817995c04 100644
--- a/drivers/iio/accel/adxl372.c
+++ b/drivers/iio/accel/adxl372.c
@@ -575,6 +575,14 @@ static int adxl372_setup(struct adxl372_state *st)
 		return -ENODEV;
 	}
 
+	/*
+	 * Perform a software reset to make sure the device is in a consistent
+	 * state after start up.
+	 */
+	ret = regmap_write(st->regmap, ADXL372_RESET, ADXL372_RESET_CODE);
+	if (ret < 0)
+		return ret;
+
 	ret = adxl372_set_op_mode(st, ADXL372_STANDBY);
 	if (ret < 0)
 		return ret;
-- 
2.20.1