iio: adc: ad7606: Allow reconfigration after reset

According to datasheet, ad7616 require at least 15ms after a restart
to fully reconfigure and being able to receive new commands via spi.

Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
index 9eec3db01a1705e9cf345c96bd63e1d2ed5e563c..a6034cf7238a18565142b9eee3f201b9cf641a00 100644 (file)
--- a/drivers/iio/adc/ad7606.c
+++ b/drivers/iio/adc/ad7606.c
@@ -594,6 +594,10 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
        if (ret)
                dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
 
+       /* AD7616 requires al least 15ms to reconfigure after a reset */
+       if (msleep_interruptible(15))
+               return -ERESTARTSYS;
+
        st->write_scale = ad7606_write_scale_hw;
        st->write_os = ad7606_write_os_hw;