iio: adc: ad7124: fix DT configuration parsing

[ Upstream commit 61cbfb5368dd50ed0d65ce21d305aa923581db2b ]

The cfg pointer is set before reading the channel number that the
configuration should point to. This causes configurations to be shifted
by one channel.
For example setting bipolar to the first channel defined in the DT will
cause bipolar mode to be active on the second defined channel.

Fix by moving the cfg pointer setting after reading the channel number.

Fixes: 7b8d045e497a ("iio: adc: ad7124: allow more than 8 channels")
Signed-off-by: Dumitru Ceclan <dumitru.ceclan@analog.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240806085133.114547-1-dumitru.ceclan@analog.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index bd323c6bd75699d1a08b606de574cd39ed26eeaa..d2fe0269b6d3af6b083c1b5d9db5d1eb9ee8b814 100644 (file)
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -842,8 +842,6 @@ static int ad7124_parse_channel_config(struct iio_dev *indio_dev,
        st->channels = channels;
 
        device_for_each_child_node_scoped(dev, child) {
-               cfg = &st->channels[channel].cfg;
-
                ret = fwnode_property_read_u32(child, "reg", &channel);
                if (ret)
                        return ret;
@@ -861,6 +859,7 @@ static int ad7124_parse_channel_config(struct iio_dev *indio_dev,
                st->channels[channel].ain = AD7124_CHANNEL_AINP(ain[0]) |
                                                  AD7124_CHANNEL_AINM(ain[1]);
 
+               cfg = &st->channels[channel].cfg;
                cfg->bipolar = fwnode_property_read_bool(child, "bipolar");
 
                ret = fwnode_property_read_u32(child, "adi,reference-select", &tmp);