Add support for STM32MP23 and STM32MP25 Analog to Digital Converter.
It's a variant of other supported STM32MP ADCs. Add the DT bindings,
driver, SOC DTS and an example on stm32mp257f-ev1 board.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
---
Changes in v2:
- dt-bindings: updates since discussion with Jonathan. Drop fallback
  compatible and "st,adc-trigger-sel".
- driver: address Jonathan and Andy comments and overall:
  - Split into several pieces to prepare the infrastructure without
    functional change
  - Add stm32mp23/25 support
  - Then add vddgpu feature.
- Rebased on top of fixes sent separately, since pre-existing issues have
  been reported by Sashiko on v1.
  https://patch.msgid.link/20260916-adc-fix-intchan-v1-v3-1-b5f05b86bc60@foss.st.com
  https://patch.msgid.link/20260916-adc-fix-div0-v3-1-bedf027a6e7e@foss.st.com
- Link to v1: https://patch.msgid.link/20260911-adc-stm32mp25-v1-v1-0-cef26eecdef2@foss.st.com

---
Cheick Traore (1):
      arm64: dts: st: add ADC nodes on stm32mp231

Fabrice Gasnier (10):
      dt-bindings: iio: adc: stm32-adc: add support for stm32mp23 and stm32mp25
      iio: adc: stm32-adc: core: manage clock prescaler diversity
      iio: adc: stm32-adc: core: configurable number of interrupts
      iio: adc: stm32-adc: rework internal channels data
      iio: adc: stm32-adc: add vreg enable option to manage diversity
      iio: adc: stm32-adc: add support for stm32mp25
      iio: adc: stm32-adc: add support for stm32mp23
      iio: adc: stm32: add support for vddgpu on stm32mp23 and stm32mp25
      arm64: dts: st: add ADC nodes on stm32mp251
      arm64: dts: st: add ADC support on stm32mp257f-ev1 board

Olivier Moysan (1):
      iio: adc: stm32-adc: manage characterization voltage diversity

Patrice Chotard (2):
      arm64: dts: st: add vrefint calibration on stm32mp23
      arm64: dts: st: add vrefint calibration on stm32mp25

 .../devicetree/bindings/iio/adc/st,stm32-adc.yaml  |  71 +++
 arch/arm64/boot/dts/st/stm32mp231.dtsi             | 116 +++++
 arch/arm64/boot/dts/st/stm32mp251.dtsi             | 116 +++++
 arch/arm64/boot/dts/st/stm32mp257f-ev1.dts         |  22 +
 drivers/iio/adc/stm32-adc-core.c                   |  95 +++-
 drivers/iio/adc/stm32-adc-core.h                   |  21 +
 drivers/iio/adc/stm32-adc.c                        | 570 ++++++++++++++++++++-
 7 files changed, 965 insertions(+), 46 deletions(-)
---
base-commit: 182c47735554925da9605dc9dd90a8c15a1bbae5
change-id: 20260911-adc-stm32mp25-v1-2ac7328559d9

Best regards,
--  
Fabrice Gasnier <fabrice.gasnier@foss.st.com>