staging:iio:ad7793: Use usleep_range instead of msleep

It is recommended to use usleep_range instead of msleep for durations smaller
than a 20ms.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c
index bd1358e..55d302d 100644 (file)
--- a/drivers/staging/iio/adc/ad7793.c
+++ b/drivers/staging/iio/adc/ad7793.c
@@ -122,7 +122,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
        ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
        if (ret < 0)
                goto out;
-       msleep(1); /* Wait for at least 500us */
+       usleep_range(500, 2000); /* Wait for at least 500us */
 
        /* write/read test for device presence */
        ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id);