iio: adc: stm32-dfsdm: handle label as an optional property

The label property is defined as optional in the DFSDM binding.
Parse the label property only when it is defined in the device tree.

Fixes: 3208fa0cd919 ("iio: adc: stm32-dfsdm: adopt generic channels bindings")
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Link: https://patch.msgid.link/20241114102459.2497178-1-olivier.moysan@foss.st.com
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 1f9eca2fb2bf8ca0d681b452cb7e2054f07b33c2..fe11b0d8eab37615a9ad03ac204ef78c057e5ad5 100644 (file)
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -691,11 +691,14 @@ static int stm32_dfsdm_generic_channel_parse_of(struct stm32_dfsdm *dfsdm,
                return -EINVAL;
        }
 
-       ret = fwnode_property_read_string(node, "label", &ch->datasheet_name);
-       if (ret < 0) {
-               dev_err(&indio_dev->dev,
-                       " Error parsing 'label' for idx %d\n", ch->channel);
-               return ret;
+       if (fwnode_property_present(node, "label")) {
+               /* label is optional */
+               ret = fwnode_property_read_string(node, "label", &ch->datasheet_name);
+               if (ret < 0) {
+                       dev_err(&indio_dev->dev,
+                               " Error parsing 'label' for idx %d\n", ch->channel);
+                       return ret;
+               }
        }
 
        df_ch =  &dfsdm->ch_list[ch->channel];