linux-kernel - [PATCH v1 05/15] iio: adc: ad7768-1: set MOSI idle state to high

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Message-ID: <714ff48341753de0509208e3c553b19c1c43e480.1736201898.git.Jonathan.Santos@analog.com>
Date: Tue, 7 Jan 2025 12:25:19 -0300
From: Jonathan Santos <Jonathan.Santos@...log.com>
To: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Jonathan Santos <Jonathan.Santos@...log.com>, <lars@...afoo.de>,
        <Michael.Hennerich@...log.com>, <jic23@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <marcelo.schmitt1@...il.com>
Subject: [PATCH v1 05/15] iio: adc: ad7768-1: set MOSI idle state to high

All supported parts require that the MOSI line stays high
while in idle.

Configure SPI controller to set MOSI idle state to high.

Fixes: a5f8c7da3dbe ("iio: adc: Add AD7768-1 ADC basic support")
Signed-off-by: Jonathan Santos <Jonathan.Santos@...log.com>
---
 drivers/iio/adc/ad7768-1.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index c3cf04311c40..463a28d09c2e 100644
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -574,6 +574,15 @@ static int ad7768_probe(struct spi_device *spi)
 		return -ENOMEM;
 
 	st = iio_priv(indio_dev);
+	/*
+	 * The ADC SDI line must be kept high when
+	 * data is not being clocked out of the controller.
+	 * Request the SPI controller to make MOSI idle high.
+	 */
+	spi->mode |= SPI_MOSI_IDLE_HIGH;
+	ret = spi_setup(spi);
+	if (ret < 0)
+		return ret;
 	st->spi = spi;
 
 	st->vref = devm_regulator_get(&spi->dev, "vref");
-- 
2.34.1