[PATCH 1/5] iio: accel: adxl372: Add timestamp to FIFO data

[Md Shofiqul Islam <shofiqtest@gmail.com>]

The driver pushes FIFO samples using iio_push_to_buffers() which does
not attach a hardware timestamp to the data.  Add a scan buffer struct
with an aligned_s64 timestamp field to the driver state, capture a
single timestamp per IRQ with iio_get_time_ns(), and switch the FIFO
push loop to iio_push_to_buffers_with_timestamp().  The same timestamp
is reused for the event push call in the same handler, replacing the
duplicate iio_get_time_ns() invocation there.

Signed-off-by: Md Shofiqul Islam <shofiqtest@gmail.com>
---
 drivers/iio/accel/adxl372.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
index 545a21e5a3..521e8313b1 100644
--- a/drivers/iio/accel/adxl372.c
+++ b/drivers/iio/accel/adxl372.c
@@ -367,6 +367,10 @@ struct adxl372_state {
 	u16				watermark;
 	__be16				fifo_buf[ADXL372_FIFO_SIZE];
 	bool				peak_fifo_mode_en;
+	struct {
+		__be16 channels[3];
+		aligned_s64 ts;
+	} scan;
 	struct mutex			threshold_m; /* lock for threshold */
 };
 
@@ -703,13 +707,15 @@ static irqreturn_t adxl372_trigger_handler(int irq, void  *p)
 	struct adxl372_state *st = iio_priv(indio_dev);
 	u8 status1, status2;
 	u16 fifo_entries;
+	s64 ts;
 	int i, ret;
 
 	ret = adxl372_get_status(st, &status1, &status2, &fifo_entries);
 	if (ret < 0)
 		goto err;
 
-	adxl372_push_event(indio_dev, iio_get_time_ns(indio_dev), status2);
+	ts = iio_get_time_ns(indio_dev);
+	adxl372_push_event(indio_dev, ts, status2);
 
 	if (st->fifo_mode != ADXL372_FIFO_BYPASSED &&
 	    ADXL372_STATUS_1_FIFO_FULL(status1)) {
@@ -733,7 +739,10 @@ static irqreturn_t adxl372_trigger_handler(int irq, void  *p)
 			/* filter peak detection data */
 			if (st->peak_fifo_mode_en)
 				adxl372_arrange_axis_data(st, &st->fifo_buf[i]);
-			iio_push_to_buffers(indio_dev, &st->fifo_buf[i]);
+			memcpy(st->scan.channels, &st->fifo_buf[i],
+			       st->fifo_set_size * sizeof(__be16));
+			iio_push_to_buffers_with_timestamp(indio_dev,
+							   &st->scan, ts);
 		}
 	}
 err:
-- 
2.54.0.windows.1