iio: adc: meson: add enum for iio channel numbers
Channels could be referenced in the driver code and using enum allows to make it more robust. Signed-off-by: George Stark <GNStark@sberdevices.ru> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20230714114010.293440-5-gnstark@sberdevices.ru Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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