[PATCH v4 0/4] Rework TPS25990 direct conversions and add TPS1689 support

[Stoyan Bogdanov <sbogdanov@baylibre.com>]

This series reworks the TPS25990 PMBus driver direct conversion
handling to provide a unified and maintainable approach for devices
using non-standard direct format conversions.

The existing TPS25990-specific conversion defines are replaced with a
generic parameter enumeration and conversion descriptor using the PMBus
direct format coefficients (m, b, R). A new local structure combines
pmbus_driver_info with direct conversion data, simplifying support
for related devices sharing the same conversion model.

To avoid duplicated conversion logic in drivers, this series also adds
and exports generic helper functions from the PMBus core:
pmbus_reg2data_direct_calc() and
pmbus_data2reg_direct_calc().

With the conversion handling generalized, support for TPS1689 is added
to the TPS25990 driver. Both devices share most internal functionality,
differing mainly in supported voltage and current operating ranges.

Link to V3 at [1]

v4:
- Fix non-devicetree support as reported by Guenter Roeck
- Rework direct conversion handling to use exported PMBus core helpers
  instead of driver-local implementations
- Update dt-bindings commit message and ti,tps25990.yaml
- Clarify commit messages to better reflect the final implementation
- Add and export direct conversion helpers from pmbus_core
- Eliminate duplicated conversion code in the driver

V3:
- Fix error detected from kernel test bot regarding division

Tests:
- Test builds for x86_64, arm64, i386
- Retest driver on arm64
- Validate driver direct conversion functions manualy


V2:
- Fix error detected from kernel test bot
- Add Acked-by to dt-bindings commit
- Drop "support" from dt-bindings commit subject

[1] https://lore.kernel.org/all/20260217081203.1792025-1-sbogdanov@baylibre.com/

Stoyan Bogdanov (4):
  hwmon: (pmbus) Add and export direct conversion calculation helpers
  hwmon: (pmbus/tps25990): Rework TPS25990 direct conversion handling
  dt-bindings: hwmon: pmbus/tps25990: Add TPS1689
  hwmon: (pmbus/tps25990): Add TPS1689 support

 .../bindings/hwmon/pmbus/ti,tps25990.yaml     |   8 +-
 Documentation/hwmon/tps25990.rst              |  15 +-
 drivers/hwmon/pmbus/pmbus.h                   |   2 +
 drivers/hwmon/pmbus/pmbus_core.c              |  59 ++--
 drivers/hwmon/pmbus/tps25990.c                | 261 +++++++++++++-----
 5 files changed, 243 insertions(+), 102 deletions(-)

-- 
2.43.0