iio: adc: stm32-dfsdm: fix st,adc-alt-channel property handling

Initially st,adc-alt-channel property was defined as an enum in the DFSDM
binding. The DFSDM binding has been changed to use the new IIO backend
framework, along with the adoption of IIO generic channels.
In this new binding st,adc-alt-channel is defined as a boolean property,
but it is still handled has an enum in DFSDM driver.
Fix st,adc-alt-channel property handling in DFSDM driver.

Fixes: 3208fa0cd919 ("iio: adc: stm32-dfsdm: adopt generic channels bindings")
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 74b1b4dc6e81d228465d875d2c617438932c3104..9664b9bd75d416868def54c02ca785ffada99284 100644 (file)
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -725,9 +725,8 @@ static int stm32_dfsdm_generic_channel_parse_of(struct stm32_dfsdm *dfsdm,
        }
        df_ch->src = val;
 
-       ret = fwnode_property_read_u32(node, "st,adc-alt-channel", &df_ch->alt_si);
-       if (ret != -EINVAL)
-               df_ch->alt_si = 0;
+       if (fwnode_property_present(node, "st,adc-alt-channel"))
+               df_ch->alt_si = 1;
 
        if (adc->dev_data->type == DFSDM_IIO) {
                backend = devm_iio_backend_fwnode_get(&indio_dev->dev, NULL, node);