[PATCH v9 0/8] 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.

Version 8 provided the ability in "simple-mfd-i2c.c" to specify the
max_register value for the regmap configuration as an alternative
to providing a "full" regmap structure.  Lee Jones asked that the
max_register value take precedence if the regmap_config was also
provided.

This version changes a few things from v8:
  - Alexandre Belloni's ack is added to patch 5.
  - The max_register value in simple_mfd_data is always used if
    it is non-zero, as requested by Lee Jones.
  - The global regmap_config_8r_8v structure is back to being
    const again.
  - A new function simple_regmap_config() has been added in patch 2
    to encapsulate the logic that determines what regmap_config
    structure will be used.
      - It uses regmap_config_8r_8v if simple_mfd_data is not supplied
        for some reason.
      - It uses regmap_config_8r_8v if the simple_mfd_data defines
        neither regmap_config nor max_register.
      - Otherwise, it dynamically allocates a regmap_config structure.
        If simple_mfd_data refers to a regmap_config structure, it is
	copied into the allocated struct; otherwise regmap_config_8r_8v
	is copied.
      - Finally, if the simple_mfd_data structure provides a non-zero
        max_register value, it is used in the regmap_config.
  - A small duplicated comment in "simple-mfd-i2c.h" is removed.

  					-Alex

This series is available here:
  https://github.com/riscstar/linux/tree/outgoing/pmic-v9

Between version 8 and version 9:
  - The max_config value is always used if it is provided with the
    simple_mfd_data structure.
  - The regmap_config structure used is allocated dynamically if
    necessary; otherwise regmap_config_8r_8v is used.
  - A small duplicated comment is removed

Here is version 8 of this series:
  https://lore.kernel.org/lkml/20250710175107.1280221-1-elder@riscstar.com/

Between version 7 and version 8:
  - Change the global regmap_config to not be const in patch 2.

Here is version 7 of this series:
  https://lore.kernel.org/lkml/20250702213658.545163-1-elder@riscstar.com/

Between version 6 and version 7:
  - Revise patch 2 to preserve the option to provide a full regmap config

Here is version 6 of this series:
  https://lore.kernel.org/lkml/20250627142309.1444135-1-elder@riscstar.com/

Between version 5 and version 6:
  - Added Rob Herring's reviewed-by to patch 1
  - Add the simple MFD functionality suggested by Lee Jones
  - Update patch 3 (previously 2) accordingly

Here is version 5 of this series:
  https://lore.kernel.org/lkml/20250625164119.1068842-1-elder@riscstar.com/

Between version 4 and version 5:
  - Only check the seconds register for change when looping on read
  - Return without re-enabling the RTC if writing registers fails
  - If the RTC is disabled when reading, return an error

Here is version 4 of this series:
  https://lore.kernel.org/lkml/20250625164119.1068842-1-elder@riscstar.com/

More complete history is available at that link.


Alex Elder (8):
  dt-bindings: mfd: add support the SpacemiT P1 PMIC
  mfd: simple-mfd-i2c: specify max_register
  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                  |  50 +++++-
 drivers/mfd/simple-mfd-i2c.h                  |   5 +-
 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                 | 167 ++++++++++++++++++
 13 files changed, 647 insertions(+), 9 deletions(-)
 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: 9ee814bd78e315e4551223ca7548dd3f6bdcf1ae
-- 
2.43.0