iio: ad7793: Fix the serial interface reset

The serial interface can be reset by writing 32 consecutive 1s to the device.
'ret' was initialized correctly but its value was overwritten when
ad7793_check_platform_data() was called. Since a dedicated reset function
is present now, it should be used instead.

Fixes: 2edb769d246e ("iio:ad7793: Add support for the ad7798 and ad7799")
Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
index e6706a0..47c3d7f 100644 (file)
--- a/drivers/iio/adc/ad7793.c
+++ b/drivers/iio/adc/ad7793.c
@@ -257,7 +257,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
        unsigned int vref_mv)
 {
        struct ad7793_state *st = iio_priv(indio_dev);
-       int i, ret = -1;
+       int i, ret;
        unsigned long long scale_uv;
        u32 id;
 
@@ -266,7 +266,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
                return ret;
 
        /* reset the serial interface */
-       ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
+       ret = ad_sd_reset(&st->sd, 32);
        if (ret < 0)
                goto out;
        usleep_range(500, 2000); /* Wait for at least 500us */