[PATCH v4 0/4] Add support for MAX20830C and MAX20840C step-down DC-DC switching regulator

[Alexis Czezar Torreno <alexisczezar.torreno@analog.com>]

This series adds a few features before adding support to MAX20830C and
MAX20840C.

Patches 1 and 2 adds new resistor feedback properties that is needed to
properly scale VOUT

Patches 3 and 4 adds support for devices MAX20830C and MAX20840C.

MAX20830C and MAX20840 are step-down DC-DC switching regulator with PMBus
interface. MAX20830C is a different packaging for MAX20830, and MAX20840C
supports 40A regulation compared to MAX20830 that is only 30A.

Signed-off-by: Alexis Czezar Torreno <alexisczezar.torreno@analog.com>
---
Changes in v4:
- Patch 1/4:
    - Added missing #include for gpio
    - Removed review tag, patch edited to complete examples
- Patch 2/4:
    - casted feedback resistors to u64 to avoid possible overflow
      during scaling
- Link to v3: https://lore.kernel.org/r/20260720-dev-max20830c-v3-0-9d06d27d6da3@analog.com

Changes in v3:
- Dropped patch that add EN-GPIO property in DTS
    - discussed to be skippable until an actual use-case arise
- Patch 1/4: 
    - Carried over the completed examples from previously dropped patch
    - Kept the review tag as the carried info from the dropped patched
      was also reviewed.
- Patch 2/4: 
    - added clamping to read_vout during scaling
    - improved comments regarding future regulator support 
- Link to v2: https://lore.kernel.org/r/20260706-dev-max20830c-v2-0-37761e89bb5f@analog.com

Changes in v2:
- Patch 1/5: completing example
- Dropped patch adding GPIO enable in driver (no use case)
- Patch 3/5: added notes on READ_VOUT and related VOUT commands
- Patch 4/5: removed comment on fallback
- Patch 5/5: simplified device ID check handling
- Link to v1: https://lore.kernel.org/r/20260630-dev-max20830c-v1-0-a02786bde470@analog.com

---
Alexis Czezar Torreno (4):
      dt-bindings: hwmon: (pmbus/max20830): add VOUT feedback resistor properties and complete examples
      hwmon: (pmbus/max20830): add VOUT feedback resistor scaling support
      dt-bindings: hwmon: (pmbus/max20830): add max20830c and max20840c support
      hwmon: (pmbus/max20830): add support for max20830c and max20840c

 .../bindings/hwmon/pmbus/adi,max20830.yaml         | 30 +++++++-
 Documentation/hwmon/max20830.rst                   | 27 +++++--
 drivers/hwmon/pmbus/max20830.c                     | 87 ++++++++++++++++++----
 3 files changed, 124 insertions(+), 20 deletions(-)
---
base-commit: 1a42625604046790ea8ec61c2a749bbf76b28943
change-id: 20260630-dev-max20830c-9d38d8b0a765

Best regards,
-- 
Alexis Czezar Torreno <alexisczezar.torreno@analog.com>