Re: [PATCH v2] iio: adc: ltc2471: Fix LTC2473 differential offset

[Joshua Crofts]

On Mon,  9 Nov 2026 18:06:59 +0800
raoxu <raoxu@xxxxxxxxxxxxx> wrote:

> From: Xu Rao <raoxu@xxxxxxxxxxxxx>
> 
> The LTC2473 reports its differential conversion result as an unsigned
> 16-bit value spanning -VREF to +VREF. The IIO scale is consequently
> reported as 2 * VREF divided by 2^16.
> 
> IIO offsets are expressed in raw codes, but the driver currently returns
> -LTC2471_VREF, which is a millivolt value. This makes the processed
> reading incorrect: with a 1.25 V reference, the midpoint raw code is
> shifted by 1250 instead of 32768 codes.
> 
> Return the raw-code offset so that the midpoint maps to 0 mV and the
> endpoints map to -VREF and +VREF as intended. The single-ended LTC2471
> does not expose the offset attribute and is unaffected.
> 
> The supplied fix was reviewed and this commit message prepared with
> OpenCode AI assistance.
> 
> Fixes: 1d3eacbfa644 ("iio: Add LTC2471/LTC2473 driver")
> Signed-off-by: Xu Rao <raoxu@xxxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---

Looks fine, but please wait at least 24 hours before sending a
new version. If you spot an issue after sending the patch, please
reply to it describing the problem.

Reviewed-by: Joshua Crofts <crofts@xxxxxxxxxx>

-- 
Kind regards,
Joshua Crofts