From 919726c9e0efc6dd6476095d37b3ba8e79566c75 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Nuno=20S=C3=A1?= <nuno.sa@analog.com>
Date: Wed, 25 Aug 2021 10:41:48 +0200
Subject: [PATCH] iio: ltc2983: add support for optional reset gpio
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Check if an optional reset gpio is present and if so, make sure to reset
the device.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210825084149.11587-1-nuno.sa@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
drivers/iio/temperature/ltc2983.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
index 3b4a0e60e605..22e6a26ce6b1 100644
--- a/drivers/iio/temperature/ltc2983.c
+++ b/drivers/iio/temperature/ltc2983.c
@@ -1470,6 +1470,7 @@ static int ltc2983_probe(struct spi_device *spi)
{
struct ltc2983_data *st;
struct iio_dev *indio_dev;
+ struct gpio_desc *gpio;
const char *name = spi_get_device_id(spi)->name;
int ret;
@@ -1494,6 +1495,16 @@ static int ltc2983_probe(struct spi_device *spi)
if (ret)
return ret;
+ gpio = devm_gpiod_get_optional(&st->spi->dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(gpio))
+ return PTR_ERR(gpio);
+
+ if (gpio) {
+ /* bring the device out of reset */
+ usleep_range(1000, 1200);
+ gpiod_set_value_cansleep(gpio, 0);
+ }
+
ret = ltc2983_setup(st, true);
if (ret)
return ret;
--
2.34.1