[PATCH v5 0/7] Add MFD and regulator drivers for Hi6421 PMIC SoC

[Guodong Xu]

This patchset adds an MFD core driver and a regulator driver for Hi6421 PMIC
SoC.

Hi6421 is a PMIC SoC designed and manufactured by HiSilicon Ltd. It includes
multi-functions, such as regulators, codec, ADCs, Coulomb counter, etc.
Hi6421 can be used in various Hi3620 SoC based boards. Registers in Hi6421 are
memory bus mapped, so in this design they are accessed by regmap-mmio APIs.

Hi6421 has a requirement to keep a guard delay between its regulator's
disable and next enable. Implement this requirement in regulator core,
per Mark Brown's suggestion.

---
changes in v5:
 * rename _regulator_delay to _regulator_enable_delay
 * clean up hi6421_regulator_enable(), add 100us protective gap into
     regulator_desc's .enable_time
 * code clean up, fixes for style checking
changes in v4:
 * regulator: core:
  - add const qualifier to ops in struct regulator_desc
  - factor out _regulator_delay from _regulator_do_enable
  - add guard delay between calling regulator_disable and _enable
 * hi6421 regulator:
  - bug fix: missing min_uV for linear regualtor BUCK0~2
  - bug fix: wrong volt values in buck_3_voltages table
  - add const to hi6421 regulator_ops
  - use ldo_linear and ldo_linear_range in applicable LDOs.
  - rename regulator-name to conform to names in board schematics.
changes in v3:
 * hi6421: regulator: remove setting of constraints on board-specific
     capabilities
 * delete unecessary compatible property "hisilicon,hi6421-regulators"
 * change regulator enable/disable callback APIs to support protection
gaps, as
     required by hi6421 spec
 * split regulator set_mode/get_mode callback APIs to LDOs and BUCKs
 * delete hi6421.dtsi, mfd and regulator nodes are now in board config .dts
changes in v2:
 * use MFD APIs to manage sub-devices of Hi6421
 * use regmap-mmio for register access
 * use only generic regulator device tree property
 * rewrite regulator driver using helper APIs from both regulator and regmap
v1: first drop

Guodong Xu (7):
  regulator: core: add const qualifier to ops in struct regulator_desc
  regulator: core: factor out delay function from _regulator_do_enable
  regulator: core: add guard delay between calling regulator_disable and
    _enable
  mfd: Add hi6421 PMIC core driver
  regulator: add driver for hi6421 voltage regulator
  ARM: dts: hi3620-hi4511: Add HI6421 MFD and regulator nodes
  ARM: hi3xxx_defconfig: Enable HI6421 MFD and Regulators

 Documentation/devicetree/bindings/mfd/hi6421.txt |  37 ++
 arch/arm/boot/dts/hi3620-hi4511.dts              | 233 ++++++++
 arch/arm/configs/hi3xxx_defconfig                |   3 +
 drivers/mfd/Kconfig                              |  13 +
 drivers/mfd/Makefile                             |   1 +
 drivers/mfd/hi6421-pmic-core.c                   | 119 ++++
 drivers/regulator/Kconfig                        |  10 +
 drivers/regulator/Makefile                       |   1 +
 drivers/regulator/core.c                         | 129 +++--
 drivers/regulator/hi6421-regulator.c             | 657 +++++++++++++++++++++++
 include/linux/mfd/hi6421-pmic.h                  |  39 ++
 include/linux/regulator/driver.h                 |   8 +-
 12 files changed, 1203 insertions(+), 47 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/hi6421.txt
 create mode 100644 drivers/mfd/hi6421-pmic-core.c
 create mode 100644 drivers/regulator/hi6421-regulator.c
 create mode 100644 include/linux/mfd/hi6421-pmic.h

-- 
1.9.1