[PATCH 6.6 210/269] iio: adc: ad7124: fix chip ID mismatch

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dumitru Ceclan <mitrutzceclan@xxxxxxxxx>

commit 96f9ab0d5933c1c00142dd052f259fce0bc3ced2 upstream.

The ad7124_soft_reset() function has the assumption that the chip will
assert the "power-on reset" bit in the STATUS register after a software
reset without any delay. The POR bit =0 is used to check if the chip
initialization is done.

A chip ID mismatch probe error appears intermittently when the probe
continues too soon and the ID register does not contain the expected
value.

Fix by adding a 200us delay after the software reset command is issued.

Fixes: b3af341bbd96 ("iio: adc: Add ad7124 support")
Signed-off-by: Dumitru Ceclan <dumitru.ceclan@xxxxxxxxxx>
Reviewed-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
Link: https://patch.msgid.link/20240731-ad7124-fix-v1-1-46a76aa4b9be@xxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/iio/adc/ad7124.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -765,6 +765,7 @@ static int ad7124_soft_reset(struct ad71
 	if (ret < 0)
 		return ret;
 
+	fsleep(200);
 	timeout = 100;
 	do {
 		ret = ad_sd_read_reg(&st->sd, AD7124_STATUS, 1, &readval);






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