Re: [PATCH] iio: adc: ad7173: add calibration support

[Jonathan Cameron <jic23@kernel.org>]

On Fri, 15 Nov 2024 11:12:00 +0100
Guillaume Ranquet <granquet@baylibre.com> wrote:

> The ad7173 family of chips has up to four calibration modes.
> 
> Internal zero scale: removes ADC core offset errors.
> Internal full scale: removes ADC core gain errors.
> System zero scale: reduces offset error to the order of channel noise.
> System full scale: reduces gain error to the order of channel noise.
> 
> All voltage channels will undergo an internal zero/full scale
> calibration at bootup.
> 
> System zero/full scale can be done after bootup using the newly created
> iio interface 'sys_calibration' and 'sys_calibration_mode'
> 
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> ---
> Calibration on the ad7173 family is the same as on the ad7192 family of
> chips and mostly uses the ad_sigma_delta common code.
The documentation in sysfs-bus-iio-adc-ad7192 needs promoting.
It is still fairly devices specific though.
Maybe we need a 
sysfs-bus-iio-adc-ad ?

Note that documentation can only be in one file for a given attribute
or the docs build system complains.

Other than that, looks good to me.

Jonathan