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@xxxxxxxxxxxx [2]: https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux.git/log/?h=pwm/chardev Signed-off-by: Trevor Gamblin <tgamblin@xxxxxxxxxxxx> --- Changes in v5: - Link to v4: https://lore.kernel.org/r/20240904-ad7625_r1-v4-0-78bc7dfb2b35@xxxxxxxxxxxx [PATCH 1/3] - Picked up Reviewed-by tag from Conor, missed in v4 [PATCH 2/3] - Make frequency values in ad7625_set_sampling_freq() u32 and make struct members match. Also do the same for 'target' variable - Use DIV_ROUND_CLOSEST() and DIV_ROUND_UP() instead of ULL variants - Change occurrences of sample_rate to sample_freq to be more consistent throughout driver - Picked up Nuno's Reviewed-by tag [PATCH 3/3] - No change Changes in v4: - Link to v3: https://lore.kernel.org/r/20240819-ad7625_r1-v3-0-75d5217c76b5@xxxxxxxxxxxx - 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@xxxxxxxxxxxx [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@xxxxxxxxxxxx - 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@xxxxxxxxxxxx>
