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Add an API to support IIO generic channels binding:
http://devicetree.org/schemas/iio/adc/adc.yaml#


This new API is needed, as generic channel DT node isn't populated as a
device.
Add devm_iio_backend_fwnode_get() to allow an IIO device backend
consumer to reference backend phandles in its child nodes.
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240730084640.1307938-4-olivier.moysan@foss.st.com

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>