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Since fuel gauge does not support thermal monitoring, some vendors may couple this fuel gauge with thermal/adc sensor to monitor battery cell exact temperature. Add this feature by adding optional iio thermal channel. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: Iskren Chernev <me@iskren.info> Link: https://lore.kernel.org/r/20230731073613.10394-4-clamor95@gmail.com Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>