diff mbox series

[v2,1/2] iio: ltc2983: add support for optional reset gpio

Message ID 20210825084149.11587-1-nuno.sa@analog.com (mailing list archive)
State Accepted
Headers show
Series [v2,1/2] iio: ltc2983: add support for optional reset gpio | expand

Commit Message

Nuno Sa Aug. 25, 2021, 8:41 a.m. UTC 
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>
---
Changes in v2:

* Increased the 'usleep_range()' upper limit so that we get better
chances for not having an IRQ triggered by the hrtimers.

 drivers/iio/temperature/ltc2983.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

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;