[PATCH v4 0/5] Add RK816 PMIC support

[Alex Bee]

This series aims to add support for Rockchip RK816 PMIC series. As per
datasheet it's targeted for RK3126/RK3128 (RK816-1), RK1108 (RK816-2) and
PX3-SE (RK816-3) but might be used for other SoCs as well. The MFD consists
of an integrated RTC, a GPIO controller, two 32k clock outputs, a power
key, 3 buck- and 6 ldo regulators, 3 regulator-switches, and charger with
integrated fuel gauge. Charger and fuel gauge are not part of this series.
Two of the switches (otg/boost) are part of the binding, but not of
the driver. They must only ever be enabled if no battery charging is
happening, but it will be enabled automatically if a battery is attached
and an external power source is connected. Thus that needs some
incorporation of a yet to be added charger driver.
Integration in the existing rk8xx-infrastructure was pretty straightforward
and only needed very little tweaking. In order to not further bloat the
driver(s) too much with additional `#define`s I tried to re-use existing
ones wherever possible.

The patches are loosely based on the vendor's implementation, verified
against the datasheet and tested/measured on a RK3126 board.

I'd like to gently ping pinctrl and regulator maintainers: please have a
look at this series. I've now added Sebastian Reichel to the recipients, as
he recently added RK806 support and re-worked parts of the rk8xx drivers.

changes since v1:
  - integrated Krzysztof's feedback for the bindings and the resulting
    driver changes
  - fixed a sparse warning 

link to v1:
https://lore.kernel.org/lkml/20240321143911.90210-2-knaerzche@gmail.com/

changes since v2:
  - integrated Krzysztof's feedback to v2 of the bindings and the resulting
    driver changes

link to v2:
https://lore.kernel.org/lkml/20240323085852.116756-1-knaerzche@gmail.com/

changes since v3:
  - integrated Krzysztof's feedback to the bindings of v3 
  - integrated Lee's feedback to the mfd part of v3 

link to v3:
https://lore.kernel.org/lkml/20240323132757.141861-2-knaerzche@gmail.com/

Please see individual patches for details about the changes.

Alex Bee (5):
  dt-bindings: mfd: Add rk816 binding
  mfd: rk8xx: Add RK816 support
  pinctrl: rk805: Add rk816 pinctrl support
  regulator: rk808: Support apply_bit for
    rk808_set_suspend_voltage_range
  regulator: rk808: Add RK816 support

 .../bindings/mfd/rockchip,rk816.yaml          | 274 ++++++++++++++++++
 drivers/mfd/Kconfig                           |   4 +-
 drivers/mfd/rk8xx-core.c                      | 104 +++++++
 drivers/mfd/rk8xx-i2c.c                       |  45 ++-
 drivers/pinctrl/pinctrl-rk805.c               |  69 +++++
 drivers/regulator/rk808-regulator.c           | 218 +++++++++++++-
 include/linux/mfd/rk808.h                     | 144 +++++++++
 7 files changed, 851 insertions(+), 7 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/rockchip,rk816.yaml

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2.43.2