From: Antoniu Miclaus <antoniu.miclaus@analog.com>
Date: Thu, 26 Jun 2025 10:40:24 +0000 (+0300)
Subject: iio: adc: ad4851: add spi 3-wire support
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=695b7c42d97b2a819b5602f16eed89d08fb45981;p=users%2Fjedix%2Flinux-maple.git

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@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250626104024.8645-2-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---

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)