linux-kernel - [PATCH 2/2] iio: adc: ad4851: add spi 3-wire support

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Message-ID: <20250626104024.8645-2-antoniu.miclaus@analog.com>
Date: Thu, 26 Jun 2025 13:40:24 +0300
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-iio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>
Subject: [PATCH 2/2] iio: adc: ad4851: add spi 3-wire support

Add support for 3-wire configuration within the driver.
By default 4-wire configuration is used.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
 drivers/iio/adc/ad4851.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ad4851.c b/drivers/iio/adc/ad4851.c
index 31e1e02c0ce3..1ad77f2a4580 100644
--- a/drivers/iio/adc/ad4851.c
+++ b/drivers/iio/adc/ad4851.c
@@ -444,10 +444,12 @@ static int ad4851_setup(struct ad4851_state *st)
 	if (ret)
 		return ret;
 
-	ret = regmap_write(st->regmap, AD4851_REG_INTERFACE_CONFIG_A,
-			   AD4851_SDO_ENABLE);
-	if (ret)
-		return ret;
+	if (!(st->spi->mode & SPI_3WIRE)) {
+		ret = regmap_write(st->regmap, AD4851_REG_INTERFACE_CONFIG_A,
+				   AD4851_SDO_ENABLE);
+		if (ret)
+			return ret;
+	}
 
 	ret = regmap_read(st->regmap, AD4851_REG_PRODUCT_ID_L, &product_id);
 	if (ret)
-- 
2.49.0