linux-kernel - [PATCH 2/2] iio: adc: ad4130: only set GPIO

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Date: Wed,  7 Feb 2024 15:20:06 +0200
From: Cosmin Tanislav <demonsingur@...il.com>
To: 
Cc: Cosmin Tanislav <cosmin.tanislav@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Cosmin Tanislav <demonsingur@...il.com>
Subject: [PATCH 2/2] iio: adc: ad4130: only set GPIO_CTRL if pin is unused

Currently, GPIO_CTRL bits are set even if the pins are used for
measurements.

GPIO_CTRL bits should only be set if the pin is not used for
other functionality.

Fix this by only setting the GPIO_CTRL bits if the pin has no
other function.

Fixes: 62094060cf3a ("iio: adc: ad4130: add AD4130 driver")
Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
---
 drivers/iio/adc/ad4130.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/ad4130.c b/drivers/iio/adc/ad4130.c
index c7df499f9775..febb64e67955 100644
--- a/drivers/iio/adc/ad4130.c
+++ b/drivers/iio/adc/ad4130.c
@@ -1864,10 +1864,14 @@ static int ad4130_setup(struct iio_dev *indio_dev)
 		return ret;
 
 	/*
-	 * Configure all GPIOs for output. If configured, the interrupt function
-	 * of P2 takes priority over the GPIO out function.
+	 * Configure unused GPIOs for output. If configured, the interrupt
+	 * function of P2 takes priority over the GPIO out function.
 	 */
-	val =  AD4130_IO_CONTROL_GPIO_CTRL_MASK;
+	val = 0;
+	for (i = 0; i < AD4130_MAX_GPIOS; i++)
+		if (st->pins_fn[i + AD4130_AIN2_P1] == AD4130_PIN_FN_NONE)
+			val |= FIELD_PREP(AD4130_IO_CONTROL_GPIO_CTRL_MASK, BIT(i));
+
 	val |= FIELD_PREP(AD4130_IO_CONTROL_INT_PIN_SEL_MASK, st->int_pin_sel);
 
 	ret = regmap_write(st->regmap, AD4130_IO_CONTROL_REG, val);
-- 
2.43.0