[PATCH v2 0/2] iio: adc: Add Axiado SARADC driver

[Petar Stepanovic]

This series adds support for the SAR ADC controller found on Axiado
AX3000 and AX3005 SoCs.

A new driver is needed because this SAR ADC controller is a SoC-specific
hardware block used on Axiado SoCs. It has its own register layout,
channel enable handling, conversion control, and data readout sequence,
and it does not match any existing upstream IIO ADC driver.

AX3000 provides sixteen input channels, while AX3005 provides eight
input channels. The driver uses SoC match data to select the number of
available channels for each compatible.

The driver supports single-shot voltage reads through the IIO subsystem
and uses the reference voltage regulator for scale calculation.

The datasheet is not publicly available. Public high-level product
information is available at:

  https://axiado.com/products/#AX3080

The register definitions and programming sequence used by this driver
are based on Axiado internal SoC documentation.

Signed-off-by: Petar Stepanovic <pstepanovic at axiado.com>
---
Changes in v2:
- Fixed the devicetree example node name to use the generic ADC node name.
- Removed the explicit `depends on OF` from Kconfig.
- Cleaned up and reordered header includes.
- Added missing includes for `bits.h`, `clk.h`, `cleanup.h`, and `err.h`.
- Removed unused `linux/kernel.h` include.
- Renamed register offset macros to use the `_REG` suffix.
- Renamed register bitfield macros to include the register name prefix.
- Added separate macros for `GLOBAL_CTRL` and `MANUAL_CTRL` register
  fields and values.
- Replaced `iowrite32()` / `ioread32()` with `writel()` / `readl()`.
- Moved ADC conversion locking into `axiado_saradc_conversion()` using
  `guard(mutex)`.
- Replaced `usleep_range()` with `fsleep()`.
- Renamed `vref_uv` to `vref_uV`.
- Added SoC-specific device names in `axiado_saradc_soc_data`.
- Used the fixed SoC-specific name for `indio_dev->name`.
- Removed unused buffered scan configuration from IIO channels.
- Added a managed cleanup action to disable the SARADC hardware on driver
  unbind or probe failure.
- Switched to a local `struct device *dev` helper in probe.
- Used `devm_mutex_init()` for mutex initialization.
- Simplified error handling by using `dev_err_probe()`.
- Updated probe variable declarations to follow reverse Christmas tree
  order.
- Fixed the `of_device_id` terminator style.
- Replaced `KBUILD_MODNAME` with a fixed driver name string.
- Link to v1: https://lore.kernel.org/r/20260528-axiado-ax3000-ax3005-saradc-v1-0-345dd5f6608a@axiado.com

---
Petar Stepanovic (2):
      dt-bindings: iio: adc: add Axiado AX3000/AX3005 SARADC
      iio: adc: add Axiado SARADC driver

 .../bindings/iio/adc/axiado,ax3000-saradc.yaml     |  63 ++++++
 MAINTAINERS                                        |   8 +
 drivers/iio/adc/Kconfig                            |  10 +
 drivers/iio/adc/Makefile                           |   1 +
 drivers/iio/adc/axiado_saradc.c                    | 244 +++++++++++++++++++++
 5 files changed, 326 insertions(+)
---
base-commit: 51f0c0b8545b23963afd5d43a8f56ee05bfa54da
change-id: 20260508-axiado-ax3000-ax3005-saradc-151aed5d25da

Best regards,
-- 
Petar Stepanovic <pstepanovic at axiado.com>