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iio: adc: aspeed: Restructure the model data
This patch refactors the model data structure to distinguish the function form different versions of aspeed ADC. - Rename the vref_voltage to vref_fixed_mv and add vref_mv driver data When driver probe will check vref_fixed_mv value and store it to vref_mv which isn't const value. - Add num_channels Make num_channles of iio device can be changed by different model_data - Add need_prescaler flag and scaler_bit_width The need_prescaler flag is used to tell the driver the clock divider needs another Prescaler and the scaler_bit_width to set the clock divider bitfield width. Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com> Link: https://lore.kernel.org/r/20210922081520.30580-3-billy_tsai@aspeedtech.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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