linux-kernel - [PATCH v1 07/15] iio: adc: ad7768-1: Add reset gpio

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Message-ID: <45cfd15501384a183a97d871b6848fb79fdb7b39.1736201898.git.Jonathan.Santos@analog.com>
Date: Tue, 7 Jan 2025 12:25:41 -0300
From: Jonathan Santos <Jonathan.Santos@...log.com>
To: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Sergiu Cuciurean <sergiu.cuciurean@...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 07/15] iio: adc: ad7768-1: Add reset gpio

From: Sergiu Cuciurean <sergiu.cuciurean@...log.com>

Depending on the controller, the default state of a gpio can vary. This
change excludes the probability that the dafult state of the ADC reset
gpio will be HIGH if it will be passed as reference in the deivcetree.

Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
---
 drivers/iio/adc/ad7768-1.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index 881446462ff5..f73b9aec8b0f 100644
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -161,6 +161,7 @@ struct ad7768_state {
 	struct completion completion;
 	struct iio_trigger *trig;
 	struct gpio_desc *gpio_sync_in;
+	struct gpio_desc *gpio_reset;
 	const char *labels[ARRAY_SIZE(ad7768_channels)];
 	/*
 	 * DMA (thus cache coherency maintenance) may require the
@@ -441,6 +442,18 @@ static int ad7768_setup(struct ad7768_state *st)
 {
 	int ret;
 
+	st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset",
+						 GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_reset))
+		return PTR_ERR(st->gpio_reset);
+
+	if (st->gpio_reset) {
+		gpiod_direction_output(st->gpio_reset, 1);
+		usleep_range(10, 15);
+		gpiod_direction_output(st->gpio_reset, 0);
+		usleep_range(10, 15);
+	}
+
 	/*
 	 * Two writes to the SPI_RESET[1:0] bits are required to initiate
 	 * a software reset. The bits must first be set to 11, and then
-- 
2.34.1