linux-kernel - [PATCH v2 2/9] iio: dac: ad3552r-hs: clear reset status flag

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Message-Id: <20250108-wip-bl-ad3552r-axi-v0-iio-testing-carlos-v2-2-2dac02f04638@baylibre.com>
Date: Wed, 08 Jan 2025 18:29:16 +0100
From: Angelo Dureghello <adureghello@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Mihail Chindris <mihail.chindris@...log.com>, Nuno Sa <nuno.sa@...log.com>, 
 David Lechner <dlechner@...libre.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Angelo Dureghello <adureghello@...libre.com>
Subject: [PATCH v2 2/9] iio: dac: ad3552r-hs: clear reset status flag

From: Angelo Dureghello <adureghello@...libre.com>

Clear reset status flag, to keep error status register
clean after reset (ad3552r manual, rev B table 38).

Reset error flag was left to 1, so debugging registers, the
"Error Status Register" was dirty (0x01). It is important
to clear this bit, so if there is any reset event over normal
working mode, it is possible to detect it.

Fixes: 0b4d9fe58be8 ("iio: dac: ad3552r: add high-speed platform driver")
Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
---
 drivers/iio/dac/ad3552r-hs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/iio/dac/ad3552r-hs.c b/drivers/iio/dac/ad3552r-hs.c
index 216c634f3eaf..8974df625670 100644
--- a/drivers/iio/dac/ad3552r-hs.c
+++ b/drivers/iio/dac/ad3552r-hs.c
@@ -329,6 +329,12 @@ static int ad3552r_hs_setup(struct ad3552r_hs_state *st)
 		dev_info(st->dev, "Chip ID error. Expected 0x%x, Read 0x%x\n",
 			 AD3552R_ID, id);
 
+	/* Clear reset error flag, see ad3552r manual, rev B table 38. */
+	ret = st->data->bus_reg_write(st->back, AD3552R_REG_ADDR_ERR_STATUS,
+				      AD3552R_MASK_RESET_STATUS, 1);
+	if (ret)
+		return ret;
+
 	ret = st->data->bus_reg_write(st->back,
 				      AD3552R_REG_ADDR_SH_REFERENCE_CONFIG,
 				      0, 1);

-- 
2.47.0