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Most of the functions that read values return a status and put the value itself in an a function parameter. Update charge reading to match. As charge state is not checked for changes as part of the update loop, remove the read of this from the periodic update loop. This saves I2C/1W bandwidth. It also means we do not have to cache it, fresh values are read when requested. Signed-off-by: Andrew Davis <afd@ti.com> Link: https://lore.kernel.org/r/20240325203129.150030-3-afd@ti.com Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>