According to the datasheet the ADXL313 uses 13 bit in full resolution.
Also, add signedness, storage bits and endianness.

Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
---
 drivers/iio/accel/adxl313_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/accel/adxl313_core.c b/drivers/iio/accel/adxl313_core.c
index 000f59e2db87..ab889d50b4d4 100644
--- a/drivers/iio/accel/adxl313_core.c
+++ b/drivers/iio/accel/adxl313_core.c
@@ -184,7 +184,10 @@ static const int adxl313_odr_freqs[][2] = {
 	.info_mask_shared_by_type_available =				\
 		BIT(IIO_CHAN_INFO_SAMP_FREQ),				\
 	.scan_type = {							\
+		.sign = 's',						\
 		.realbits = 13,						\
+		.storagebits = 16,					\
+		.endianness = IIO_BE,					\
 	},								\
 }
 
-- 
2.39.5