[PATCH v2 3/7] iio: imu: fxos8700: fix incompete ACCEL and MAGN channels readback

[carlos.song@nxp.com]

From: Carlos Song <carlos.song@nxp.com>

The length of ACCEL and MAGN 3-aix channels output data is 6 byte
individually. However block only read 3 bytes data into buffer from
ACCEL or MAGN output data registers every time. It causes an incompete
ACCEL and MAGN channels readback.

Set correct value count for regmap_bulk_read to get 6 bytes ACCEL and
MAGN channels readback.

Fixes: 84e5ddd5c46e ("iio: imu: Add support for the FXOS8700 IMU")
Signed-off-by: Carlos Song <carlos.song@nxp.com>
---
Changes for V2:
- Reserve the global DMA safe buffer
- Use sizeof(data->buf) instead of hardcoded FXOS8700_DATA_BUF_SIZE
- Rework commit log

diff --git a/drivers/iio/imu/fxos8700_core.c b/drivers/iio/imu/fxos8700_core.c
index 977eb7dc7dbd..b62bc92bbacc 100644
--- a/drivers/iio/imu/fxos8700_core.c
+++ b/drivers/iio/imu/fxos8700_core.c
@@ -414,7 +414,7 @@ static int fxos8700_get_data(struct fxos8700_data *data, int chan_type,
 
 	/* Block read 6 bytes of device output registers to avoid data loss */
 	ret = regmap_bulk_read(data->regmap, base, data->buf,
-			       FXOS8700_DATA_BUF_SIZE);
+			       sizeof(data->buf));
 	if (ret)
 		return ret;
 
-- 
2.34.1