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The IIO_CHAN_INFO_PEAK info element is used for maximum values and currently there is no equivalent for minimum values. Instead of overloading the existing peak info element, a new info element can be added. In principle there is no need to add a _TROUGH_SCALE element as the scale will be the same as the one required for INFO_PEAK, which in turn is sometimes omitted if a single scale for peaks and raw values is required. Add an IIO_CHAN_INFO_TROUGH info element for minimum values. Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com> Link: https://lore.kernel.org/r/20231211122747.9723-1-579lpy@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>