Add device tree bindings and a driver for the regulators found in the
Spreadtrum/Unisoc SC2730 PMIC.

The second patch in this series depends on the first patch.

Signed-off-by: Otto Pflüger <otto.pflueger@abscue.de>
---
Changes in v4:
- Add missing patch for MFD cell registration
- Use conditional binding for referencing the regulators now that the
  child node cannot be distinguished by its compatible for validation
  purposes.
- Drop requirement for removed compatible property (sorry, should have
  double-checked this before sending v3)
- Link to v3: https://lore.kernel.org/r/20260519-sc2730-regulators-v3-0-5bf0e02507e3@abscue.de

Changes in v3:
- Drop compatible property
- Drop unused VDDSIM0 and VDDSIM1 IDs
- Link to v2: https://lore.kernel.org/r/20260518-sc2730-regulators-v2-0-9a5b3a7b1e49@abscue.de

Changes in v2:
- Use lowercase names without underscores for device tree nodes
- Use oneOf for binding reference instead of making it conditional
- Remove some excess line breaks
- Fix author name in driver and add original Signed-off-by
- Link to v1: https://lore.kernel.org/r/20260220-sc2730-regulators-v1-0-3f2bbc9ecf14@abscue.de

---
Otto Pflüger (4):
      regulator: dt-bindings: Add Unisoc SC2730 PMIC
      dt-bindings: mfd: sprd,sc2731: Include SC2730 regulator bindings
      mfd: sprd-sc27xx: Add SC2730 regulator cell
      regulator: Add regulator driver for Unisoc SC2730 PMIC

 .../devicetree/bindings/mfd/sprd,sc2731.yaml       |  21 +-
 .../bindings/regulator/sprd,sc2730-regulator.yaml  |  44 +++
 drivers/mfd/sprd-sc27xx-spi.c                      |   1 +
 drivers/regulator/Kconfig                          |   7 +
 drivers/regulator/Makefile                         |   1 +
 drivers/regulator/sc2730-regulator.c               | 411 +++++++++++++++++++++
 6 files changed, 484 insertions(+), 1 deletion(-)
---
base-commit: 550604d6c9b9efc8d068aff94dc301694a7afdee
change-id: 20260216-sc2730-regulators-13ba789641a4

Best regards,
-- 
Otto Pflüger <otto.pflueger@abscue.de>