[PATCH v4 0/3] iio: adc: add new ad7625 driver

Trevor Gamblin
2024-09-04T19:14:22Z

This series adds a new driver for the Analog Devices Inc. AD7625,
AD7626, AD7960, and AD7961. These chips are part of a family of
LVDS-based SAR ADCs. The initial driver implementation does not support
the devices' self-clocked mode, although that can be added later.

The devices make use of two offset PWM signals, one to trigger
conversions and the other as a burst signal for transferring data to the
host. These rely on the new PWM waveform functionality being
reviewed in [1] and also available at [2].

This work is being done by BayLibre and on behalf of Analog Devices
Inc., hence the maintainers are @analog.com.

Special thanks to David Lechner for his guidance and reviews.

[1]: https://lore.kernel.org/linux-pwm/cover.1722261050.git.u.kleine-koenig@baylibre.com
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git/log/?h=pwm/chardev

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
---
Changes in v4:
- Link to v3: https://lore.kernel.org/r/20240819-ad7625_r1-v3-0-75d5217c76b5@baylibre.com
- Rebase on top of latest pwm/chardev branch at:
https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git/log/?h=pwm/chardev

[PATCH 1/3]
- No change

[PATCH 2/3]
- Add 'depends on PWM' under 'CONFIG AD7625' in
drivers/iio/adc/Kconfig, based on v3 discussions
- Cleanup whitespace usage in Kconfig, bandwidth logic to match
Jonathan's suggestions

[PATCH 3/3]
- No change

Changes in v3:
- Link to v2: https://lore.kernel.org/r/20240809-ad7625_r1-v2-0-f85e7ac83150@baylibre.com

[PATCH 1/3]
- Add gpio bindings header, en0-gpios and en1-gpios to binding example
- Remove unnecessary comments

[PATCH 2/3]
- No change

[PATCH 3/3]
- No change

Changes in v2:
- Link to v1 (marked as RFC): https://lore.kernel.org/r/20240731-ad7625_r1-v1-0-a1efef5a2ab9@baylibre.com
- Include link to required PWM patch series in cover letter (missing before)
- Include new link to the pwm/chardev branch of Uwe's kernel tree

[PATCH 1/3]
- Rework dt bindings to be compliant using make dt_binding_check
- Add "adi,no-dco" flag to address indication of how DCO lines are
configured
- Fix binding patch message
- Remove chip packaging info from binding description
- Move comments around to be clearer

[PATCH 2/3]
- Remove ad7625_pwm_disable(), call pwm_disable() directly
- Add ad7625_buffer_preenable() and ad7625_buffer_postdisable()
functions
- Add devm_ad7625_regulator_setup() function, move all regulator logic
to it, consolidate the comment blocks related to it above
- Add have_refin flag in ad7625_state struct
- Add pwm_waveform structs to ad7625_state struct for storing
requested waveform characteristics
- Refactor ad7625_set_sampling_freq() to set the pwm_waveform struct
values in ad7625_state, limiting PWM enable/disable to
preenable/postdisable functions
- Remove redundant dev_err_probe() after devm_ad7625_pwm_get()
- Use device_property_read_bool() instead of device_property_present()
- General alignment and line wrapping fixes

[PATCH 3/3]
- No change

---
Trevor Gamblin (3):
dt-bindings: iio: adc: add AD762x/AD796x ADCs
iio: adc: ad7625: add driver
docs: iio: new docs for ad7625 driver

.../devicetree/bindings/iio/adc/adi,ad7625.yaml | 176 ++++++
Documentation/iio/ad7625.rst | 91 +++
MAINTAINERS | 11 +
drivers/iio/adc/Kconfig | 16 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ad7625.c | 684 +++++++++++++++++++++
6 files changed, 979 insertions(+)
---
base-commit: 1ebd3850421749eb44bd040b249bd4db88d35b33
change-id: 20240730-ad7625_r1-60d17ea28958

Best regards,
--
Trevor Gamblin <tgamblin@baylibre.com>