[PATCH v3 0/3] Add RK801 PMIC support

[Joseph Chen]

This patch series adds support for the Rockchip RK801 Power Management
Integrated Circuit (PMIC) to the Linux kernel.

The RK801 is a PMIC designed for multimedia and handheld devices. It
includes:
- 4 BUCK regulators (DCDC)
- 2 LDO regulators
- 1 SWITCH regulator
- Interrupt support for power key events

The implementation follows the existing rk808 MFD driver architecture
and integrates RK801 as a new variant in the RK8XX family.

Patch 1 adds the device tree binding documentation for RK801, describing
the compatible string, regulators configuration, and example usage.

Patch 2 adds the MFD core support for RK801, including device detection
and register definitions.

Patch 3 adds the regulator driver support for RK801, implementing the
4 BUCK regulators, 2 LDO regulators, and 1 SWITCH regulator.

Changes in v3:
- Fix patch split issue: MFD patch incorrectly removed the entire
  drivers/regulator/rk808-regulator.c file in v2
- Kconfig description: use "Rockchip RK8xx Power Management Chips"
  instead of listing all individual chips (suggested by Heiko)

Changes in v2:
- Include all necessary To/Cc entries
- Rename pmic/regulator names from uppercase to lowercase(dcdc[1-4]|ldo[1-2]|switch)
  to align with DT coding style
- Drop 'rockchip,system-power-controller'
- Remove unused 'pwrctrl-gpios' from DT binding example
- Split regulator support into a separate patch (was part of mfd patch in v1)

Joseph Chen (3):
  dt-bindings: mfd: Add rk801 binding
  mfd: rk8xx: Add RK801 support
  regulator: rk808: Add RK801 support

 .../bindings/mfd/rockchip,rk801.yaml          | 197 ++++++++++++++
 drivers/mfd/Kconfig                           |   6 +-
 drivers/mfd/rk8xx-core.c                      |  81 ++++++
 drivers/mfd/rk8xx-i2c.c                       |  33 ++-
 drivers/regulator/rk808-regulator.c           | 243 ++++++++++++++++++
 include/linux/mfd/rk808.h                     | 118 +++++++++
 6 files changed, 674 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/rockchip,rk801.yaml

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2.25.1