On 05/29/2015 05:47 PM, Guenter Roeck wrote:
On 05/28/2015 06:57 AM, Chris Lesiak wrote:
The function ntc_adc_iio_read (now ntc_adc_iio_read_raw) assumes
both a 12 bit ADC and that pullup_uv is the same as the ADC reference
voltage. If either assumption is false, then the result is incorrect.
For iio channels supporting either IIO_CHAN_INFO_PROCESSED or
IIO_CHAN_INFO_SCALE, the new ntc_adc_iio_read will be used. It gets
microvolts directly with a call to iio_read_channel_processed.
Signed-off-by: Chris Lesiak <chris.lesiak@xxxxxxxxx>
Looks ok to me. Applied to -next.
Thanks,
Guenter
Guenter,
I am sorry to say that I must ask you to please revert that patch.
I had a mistaken belief that iio_read_channel_processed returned
microvolts directly. But the standard voltage unit for the iio
subsystem is in fact millivolts, just as in the hwmon subsystem. I was
confused by a broken iio adc driver that in fact did scale results to
microvolts. The combination resulted in tests that pased when they
shouldn't have.
Early next week I hope to submit a new patch that uses
iio_read_channel_raw and converts the result to microvolts with
iio_convert_raw_to_processed. That allows an additional scale actor of
1000.
Thank you for your time and patience reviewing these patches.
Chris
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