adi/ad7625: add support for AD762x/AD796x

[threexc]

Description

Add basic support for the AD7625, AD7626, AD7960, and AD7961 ADCs in pyadi-iio. The corresponding driver will be merged in kernel v6.13 and backported to the ADI kernel tree shortly after, so we may not actually want to merge this just yet, but it should be sufficient to review. The driver is available in the iio kernel tree: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/log/?h=togreg

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How has this been tested?

Tested against Zedboard with e.g.:

pytest -v --hw=ad7625 --uri=ip:192.168.40.140 test/test_ad7625.py

and via emulation with:

pytest -v --hw=ad7625 --emu --emu-xml=test/emu/devices/ad7625.xml test/test_ad7625.py

Test Configuration:

• Hardware: Zedboard + EVAL-AD7626/25FMCZ, Zedboard + EVAL-AD7961FMCZ
• OS: Kuiper GNU/Linux 11.2 (bullseye) with custom kernel 6.11.0-rc1-ad7625-mainline-00027-g26f7e74e040d

Documentation

Documentation added in doc/source/devices/adi.ad7625.rst

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have signed off all commits and they contain "Signed-off by: "
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[tfcollins]

Is this channel correct? Seems odd

[threexc]

Yes, it's a differential antiphase pair of inputs making up the channel.

[tfcollins]

Generally this PR is fine. Just had the question on the channel name(s). Please fix the lint issue. You can ignore the doc link error w.r.t. ez.analog.com

[threexc]

@tfcollins by lint issue, do you mean this?

Warning, treated as error: /home/runner/work/pyadi-iio/pyadi-iio/doc/source/devices/adi.ad7625.rst:document isn't included in any toctree

[tfcollins]

@tfcollins by lint issue, do you mean this?

Warning, treated as error: /home/runner/work/pyadi-iio/pyadi-iio/doc/source/devices/adi.ad7625.rst:document isn't included in any toctree

There was an upstream error that go resolved outside of github. This here needs to be fixed. Each class needs a doc page

[threexc]

Should be fixed now. Also rebased on top of latest main branch.

[threexc]

Rebased on top of latest main.