iio: core: Add optional symbolic label to a device channel
If a label is defined in the device tree for this channel add that to the channel specific attributes. This is useful for userspace to be able to identify an individual channel. Signed-off-by: Cristian Pop <cristian.pop@analog.com> Link: https://lore.kernel.org/r/20200928090959.88842-1-cristian.pop@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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