[PATCH 4.9 20/44] iio: ad_sigma_delta: select channel when reading register

[Greg Kroah-Hartman]

From: Dragos Bogdan <dragos.bog...@analog.com>

commit fccfb9ce70ed4ea7a145f77b86de62e38178517f upstream.

The desired channel has to be selected in order to correctly fill the
buffer with the corresponding data.
The `ad_sd_write_reg()` already does this, but for the
`ad_sd_read_reg_raw()` this was omitted.

Fixes: af3008485ea03 ("iio:adc: Add common code for ADI Sigma Delta devices")
Signed-off-by: Dragos Bogdan <dragos.bog...@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardel...@analog.com>
Cc: <sta...@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jonathan.came...@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/iio/adc/ad_sigma_delta.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -121,6 +121,7 @@ static int ad_sd_read_reg_raw(struct ad_
        if (sigma_delta->info->has_registers) {
                data[0] = reg << sigma_delta->info->addr_shift;
                data[0] |= sigma_delta->info->read_mask;
+               data[0] |= sigma_delta->comm;
                spi_message_add_tail(&t[0], &m);
        }
        spi_message_add_tail(&t[1], &m);