[PATCH v4 0/7] spacemit: introduce P1 PMIC support

[Alex Elder <elder@riscstar.com>]

The SpacemiT P1 is an I2C-controlled PMIC that implements 6 buck
converters and 12 LDOs.  It contains a load switch, ADC channels,
GPIOs, a real-time clock, and a watchdog timer.

This series introduces a multifunction driver for the P1 PMIC as well
as drivers for its regulators and RTC.

This version primarily updates the RTC code (in patch 4) based on
review feedback.  It also adds adds a dependency in patch 2, to
ensure the MFD_SIMPLE_MFD_I2C dependencies are met when selected.

This series is available here:
  https://github.com/riscstar/linux/tree/outgoing/pmic-v4

					-Alex
Between version 3 and version 4:
  - I got confirmation from SpacemiT that the RTC hardware does not
    implement the "latch" of registers as documented, and updated the
    RTC code accordingly (looping on read)
  - The RTC set_time() callback now returns an error value if one is
    reported when a regmap write re-enables the RTC
  - Renamed the RTC Kconfig option to be RTC_DRV_SPACEMIT_P1
  - Renamed the RTC source file be "rtc-spacemit-p1.c"
  - Replaced an RTC enumerated type with simple numeric indices
  - A message is no longer reported when devm_rtc_register_device()
    returns an error in the RTC driver
  - CONFIG_MFD_SPACEMIT_P1 now depends on I2C, to avoid a build error
        
Here is version 3 of this series:
  https://lore.kernel.org/linux-rtc/20250622032941.3768912-2-elder@riscstar.com/

Between version 2 and version 3:
  - Removed "spacemit-pmic.c" and updated "simple-mfd-i2c.c" instead
  - Added an RTC driver, so that the MFD has more than one sub-device
  - Other suggestions were directed at "spacemit-pmic.c"

Here is version 2 of this series:
  https://lore.kernel.org/lkml/20250613210150.1468845-1-elder@riscstar.com/

Between version 1 and version 2:
  - Added Reviewed-by tag from Mark Brown to patch 3
  - Implemented suggestions from Vivian Wang:
      - Fixed a typo in the subject line in patch 1
      - Now use module_i2c_driver() for the PMIC driver in patch 2
      - Added MODULE_ALIAS() for both drivers (patches 2 and 3)
      - Defined and used DRV_NAME in both drivers
      - Added additional Kconfig module help text for both drivers

Here is version 1 of this series:
  https://lore.kernel.org/lkml/20250613210150.1468845-1-elder@riscstar.com/

Alex Elder (7):
  dt-bindings: mfd: add support the SpacemiT P1 PMIC
  mfd: simple-mfd-i2c: add SpacemiT P1 support
  regulator: spacemit: support SpacemiT P1 regulators
  rtc: spacemit: support the SpacemiT P1 RTC
  riscv: dts: spacemit: enable the i2c8 adapter
  riscv: dts: spacemit: define fixed regulators
  riscv: dts: spacemit: define regulator constraints

 .../devicetree/bindings/mfd/spacemit,p1.yaml  |  86 +++++++++
 .../boot/dts/spacemit/k1-bananapi-f3.dts      | 138 ++++++++++++++
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi  |   7 +
 arch/riscv/boot/dts/spacemit/k1.dtsi          |  11 ++
 drivers/mfd/Kconfig                           |  11 ++
 drivers/mfd/simple-mfd-i2c.c                  |  18 ++
 drivers/regulator/Kconfig                     |  12 ++
 drivers/regulator/Makefile                    |   1 +
 drivers/regulator/spacemit-p1.c               | 157 ++++++++++++++++
 drivers/rtc/Kconfig                           |  10 ++
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-spacemit-p1.c                 | 169 ++++++++++++++++++
 12 files changed, 621 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/spacemit,p1.yaml
 create mode 100644 drivers/regulator/spacemit-p1.c
 create mode 100644 drivers/rtc/rtc-spacemit-p1.c


base-commit: 1b152eeca84a02bdb648f16b82ef3394007a9dcf
-- 
2.45.2


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