Re: [PATCH v5 0/4] iio: adc: ad4080: add support for AD4880 dual-channel ADC

[Jonathan Cameron]

On Thu, 5 Mar 2026 13:37:26 +0200
Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx> wrote:

> Add support for the AD4880, a dual-channel 20-bit 40MSPS SAR ADC from
> the same family as AD4080.
> 
> The AD4880 has two independent ADC channels, each with its own SPI
> configuration interface and LVDS data output. The driver uses
> spi_new_ancillary_device() for the second channel's SPI and requires
> two io-backend instances for the data interfaces.
> 
> This series includes:
>   - Use __free(fwnode_handle) for automatic cleanup in iio backend
>   - Refactored devm_iio_backend_get_by_index() for multi-channel backend lookup
>   - DT bindings update for AD4880
>   - Driver support for AD4880
> 
> Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ad4880.pdf

Series applied with that ordering tweak in the new backend function patch.
Note that this crossed with a new device being added to the driver
and so it took a fair bit of conflict resolution. Please check I didn't mess
it up. 

Applied and pushed out as testing (subject to exiting a tunnel under London ;)

Thanks,

Jonathan

> 
> Changes in v5:
>   - Drop the SPI patches (already applied)
>   - Split the __free(fwnode_handle) cleanup into a separate patch (patch 1)
>   - Fix "Get's" -> "Gets" typo in devm_iio_backend_get_by_index()
>     kernel-doc (patch 2)
>   - Declare loop variables in for-loop initializers (patch 4)
>   - Drop redundant num_channels > 1 guard around ancillary device
>     setup loop (patch 4)
> 
> Antoniu Miclaus (4):
>   iio: backend: use __free(fwnode_handle) for automatic cleanup
>   iio: backend: add devm_iio_backend_get_by_index()
>   dt-bindings: iio: adc: ad4080: add AD4880 support
>   iio: adc: ad4080: add support for AD4880 dual-channel ADC
> 
>  .../bindings/iio/adc/adi,ad4080.yaml          |  53 +++-
>  drivers/iio/adc/ad4080.c                      | 230 ++++++++++++++----
>  drivers/iio/industrialio-backend.c            |  62 +++--
>  include/linux/iio/backend.h                   |   2 +
>  4 files changed, 278 insertions(+), 69 deletions(-)
>