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[v5,00/11] iio: adc: Add support for AD4170 series of ADCs

Message ID cover.1749582679.git.marcelo.schmitt@analog.com
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Series iio: adc: Add support for AD4170 series of ADCs | expand

Message

Marcelo Schmitt June 10, 2025, 8:30 p.m. UTC 
Hello,

This is version 5 of AD4170 support patch set.
Not many changes from v4 to v5 and not waiting as long between the previous and
this new version so, keeping both change logs below.

Thank you to all reviewers.

This patch set adds support for Analog Devices AD4170 and similar sigma-delta ADCs.

Patch 1 adds device tree documentation for the parts.
Patch 2 adds basic device support.
Patch 3 adds support for calibration scale.
Patch 4 adds support for calibration bias.
Patch 5 adds support for sample frequency along with filter type configuration.
Patch 6 adds support for buffered ADC reading.
Patch 7 adds clock provider support
Patch 8 adds GPIO controller support.
Patch 9 adds internal temperature sensor support.
Patch 10 adds support for external RTD and bridge circuit sensors.
Patch 11 adds timestamp channel


Change log v4 -> v5

[device tree changes]
- Dropped interrupt maxItems constraint.
- Spelled out RC acronym in reference-buffer description.
- Require to specify interrupt-names when using interrupts.
- Added interrupt-names to the examples.
- Made adi,excitation-pin properties identical to adi,ad4130.
- Removed interrupt-parent props from the examples.

[Basic driver patch]
- Dropped 'ret' variable set but not used, warned by 0-day test bot.
- Rephrased comment about static_assert to clarify the reason for it's usage.
- Added missing includes.
- Did a few minor code readability improvements, complying with review suggestions.

[Calibration scale/gain patch]
- Squeezed info_mask_separate additions to reduce change diff.

[External sensor patch]
- Tweaked commits/patches to reduce diff.
- Dropped unneeded local variable.

Change log v3 -> v4

[device tree changes]
- Dropped sensor-node and most of defs.
- Updated external sensor props to have similar name and type of adi,ad4130 ones.
- Added constraints for properties for related to external bridge sensor excitation.

[General IIO driver changes]
- Locked device mutex to ensure attribute read correctness on all archs
- Fixed typo unasigned -> unassigned

[Basic driver patch]
- Added previously missing #include <linux/cleanup.h>.
- Moved struct completion declaration to reduce commit diff.

[Calibration scale/gain patch]
[Calibration bias/offset patch]
- No longer restoring calib gain or calib offset on reg write fail.

[Digital filter and sample frequency config patch]
- Use scoped_guard to ensure correct lock release order in ad4170_set_filter_type().

[Buffer support patch]
- Fixed a bug in the filling of the IIO device buffer.

[CLOCK provider patch]
- Explicitly stated that clock divider (CLKDIV) control support is not provided.
- Skipped clock provider register if "#clock-cells" is not present.

[GPIO controller patch]
- Made AD4170 depend on GPIOLIB.

[External sensor patch]
- Update to string adi,sensor-type dt property.
- Adapted external sensor dt prop parsing to work with the updated version of those props.

[New patch - Add timestamp channel]


Link to v4: https://lore.kernel.org/linux-iio/cover.1748829860.git.marcelo.schmitt@analog.com/
Link to v3: https://lore.kernel.org/linux-iio/cover.1747083143.git.marcelo.schmitt@analog.com/
Link to v2: https://lore.kernel.org/linux-iio/cover.1745841276.git.marcelo.schmitt@analog.com/
Link to v1: https://lore.kernel.org/linux-iio/cover.1744200264.git.marcelo.schmitt@analog.com/


Ana-Maria Cusco (1):
  iio: adc: Add basic support for AD4170

Marcelo Schmitt (10):
  dt-bindings: iio: adc: Add AD4170
  iio: adc: ad4170: Add support for calibration gain
  iio: adc: ad4170: Add support for calibration bias
  iio: adc: ad4170: Add digital filter and sample frequency config
    support
  iio: adc: ad4170: Add support for buffered data capture
  iio: adc: ad4170: Add clock provider support
  iio: adc: ad4170: Add GPIO controller support
  iio: adc: ad4170: Add support for internal temperature sensor
  iio: adc: ad4170: Add support for weigh scale and RTD sensors
  iio: adc: ad4170: Add timestamp channel

 .../bindings/iio/adc/adi,ad4170.yaml          |  564 ++++
 MAINTAINERS                                   |    8 +
 drivers/iio/adc/Kconfig                       |   16 +
 drivers/iio/adc/Makefile                      |    1 +
 drivers/iio/adc/ad4170.c                      | 2975 +++++++++++++++++
 5 files changed, 3564 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4170.yaml
 create mode 100644 drivers/iio/adc/ad4170.c


base-commit: 4c6073fec2fee4827fa0dd8a4ab4e6f7bbc05ee6