changes v7:
- drop gpiolib irq fix and make pinctrl more robust against NULL point
  dereference.

This series adds support for the NXP MC33978/MC34978 Multiple Switch Detection
Interface (MSDI) via the MFD framework.

Architecture overview:
* mfd: Core driver handling 2-frame pipelined SPI, regulator sequencing, and
  linear irq_domain. Harvests status bits from SPI MISO MSB.
* pinctrl: Exposes 22 physical switch inputs as standard GPIOs. Proxies IRQs to
  the MFD domain.
* hwmon: Exposes thermal limits, VBATP/VDDQ voltage boundaries, and dynamic
  fault alarms.
* mux: Controls the 24-to-1 AMUX routing analog signals (switch voltages,
  temperature, VBATP) to an external ADC.

Initial pinctrl implementation by David Jander, reworked into this MFD
architecture.

Best regards,
Oleksij

David Jander (1):
  pinctrl: add NXP MC33978/MC34978 pinctrl driver

Oleksij Rempel (5):
  dt-bindings: pinctrl: add NXP MC33978/MC34978 MSDI
  mfd: add NXP MC33978/MC34978 core driver
  pinctrl: core: Make pin group callbacks optional for pin-only drivers
  hwmon: add NXP MC33978/MC34978 driver
  mux: add NXP MC33978/MC34978 AMUX driver

 .../bindings/pinctrl/nxp,mc33978.yaml         |  158 +++
 drivers/hwmon/Kconfig                         |   10 +
 drivers/hwmon/Makefile                        |    1 +
 drivers/hwmon/mc33978-hwmon.c                 |  548 +++++++++
 drivers/mfd/Kconfig                           |   15 +
 drivers/mfd/Makefile                          |    2 +
 drivers/mfd/mc33978.c                         | 1061 +++++++++++++++++
 drivers/mux/Kconfig                           |   14 +
 drivers/mux/Makefile                          |    2 +
 drivers/mux/mc33978-mux.c                     |  141 +++
 drivers/pinctrl/Kconfig                       |   16 +
 drivers/pinctrl/Makefile                      |    1 +
 drivers/pinctrl/core.c                        |   41 +-
 drivers/pinctrl/pinconf.c                     |    9 +-
 drivers/pinctrl/pinctrl-mc33978.c             |  865 ++++++++++++++
 include/linux/mfd/mc33978.h                   |   92 ++
 16 files changed, 2969 insertions(+), 7 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/nxp,mc33978.yaml
 create mode 100644 drivers/hwmon/mc33978-hwmon.c
 create mode 100644 drivers/mfd/mc33978.c
 create mode 100644 drivers/mux/mc33978-mux.c
 create mode 100644 drivers/pinctrl/pinctrl-mc33978.c
 create mode 100644 include/linux/mfd/mc33978.h

--
2.47.3