[PATCH v3] iio: adc: ad7192: replace usleep_range() with fsleep()

[Stepan Ionichev <sozdayvek@gmail.com>]

The AD7192 datasheet (Rev. A, page 34, RESET section) says:
"When a reset is initiated, the user must allow a period of
500 us before accessing any of the on-chip registers."

fsleep(500) expands to the same usleep_range(500, 1000) and
keeps the 500 us minimum.

Drop the redundant "/* Wait for at least 500us */" comment.

No functional change.

Signed-off-by: Stepan Ionichev <sozdayvek@gmail.com>
---
v3:
- Cite AD7192 datasheet for the 500 us minimum (per Andy)
- Add this changelog (was missing in v2)

v2:
- Drop the redundant "Wait for at least 500us" comment

 drivers/iio/adc/ad7192.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index 8b1664f6b..6bd9cdaa6 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -576,7 +576,7 @@ static int ad7192_setup(struct iio_dev *indio_dev, struct device *dev)
 	ret = ad_sd_reset(&st->sd);
 	if (ret < 0)
 		return ret;
-	usleep_range(500, 1000); /* Wait for at least 500us */
+	fsleep(500);
 
 	/* write/read test for device presence */
 	ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id);
-- 
2.43.0