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iio: ltc2983: add support for optional reset gpio
author
Nuno Sá
<nuno.sa@analog.com>
Wed, 25 Aug 2021 08:41:48 +0000
(10:41 +0200)
committer
Jonathan Cameron
<Jonathan.Cameron@huawei.com>
Tue, 14 Sep 2021 11:00:32 +0000
(12:00 +0100)
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
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diff --git
a/drivers/iio/temperature/ltc2983.c
b/drivers/iio/temperature/ltc2983.c
index
3b4a0e6
..
22e6a26
100644
(file)
--- 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;