iio: amplifiers: ad8366: consume enable gpio

Some parts may consume enable GPIO to enable serial mode
(HMC1119's and HMC792A P/S pin) or powerup the device
(e.g. ADA4961's PWUP pin).

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index fb787a512bff671e77fbbfb9ee03e446e9ec487f..d4499af0518a72f665ec4497f307dcd01e370f65 100644 (file)
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -217,6 +217,7 @@ static const struct iio_chan_spec ad8366_channels[] = {
 static int ad8366_probe(struct spi_device *spi)
 {
        struct device *dev = &spi->dev;
+       struct gpio_desc *enable_gpio;
        struct reset_control *rstc;
        struct iio_dev *indio_dev;
        struct ad8366_state *st;
@@ -239,6 +240,11 @@ static int ad8366_probe(struct spi_device *spi)
        st->spi = spi;
        st->info = spi_get_device_match_data(spi);
 
+       enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+       if (IS_ERR(enable_gpio))
+               return dev_err_probe(dev, PTR_ERR(enable_gpio),
+                                    "Failed to get enable GPIO\n");
+
        rstc = devm_reset_control_get_optional_exclusive_deasserted(dev, NULL);
        if (IS_ERR(rstc))
                return dev_err_probe(dev, PTR_ERR(rstc),