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iio: ltc2983: add support for optional reset gpio 

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>
This commit is contained in:
Nuno Sá 2021-08-25 10:41:48 +02:00 committed by Jonathan Cameron
parent 26df977a90
commit 919726c9e0
1 changed files with 11 additions and 0 deletions
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11
drivers/iio/temperature/ltc2983.c
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@ -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;