[PATCH v4 0/1] mfd: nct6694: Refactor transport layer and add HIF (eSPI) support

[a0282524688@gmail.com]

From: Ming Yu <a0282524688@gmail.com>

The Nuvoton NCT6694 is a peripheral expander that provides GPIO, I2C,
CAN-FD, Watchdog, HWMON, PWM, and RTC sub-devices. Currently, the
driver only supports USB as the host transport interface.

This series refactors the NCT6694 MFD core to support multiple transport
backends and adds a new Host Interface (HIF) transport driver that
communicates over eSPI using Super-I/O shared memory.

Changes since version 3:
- Remove redundant module type macro definitions from sub-device drivers
  that are now provided by the shared header <linux/mfd/nct6694.h>,
  fixing -Wmacro-redefined warnings.

Changes since version 2:
- Restore per-device IDA and mfd_add_hotplug_devices()/PLATFORM_DEVID_AUTO
  to avoid child device ID conflicts with multiple NCT6694 chips.
- Validate irq_find_mapping() return value before dispatching IRQs.
- Check superio_enter() return value in nct6694_irq_init().

Changes since version 1:
- Reworked the Super-I/O access helpers.

Ming Yu (1):
  mfd: Add Host Interface (HIF) support for Nuvoton NCT6694

 MAINTAINERS                         |   1 +
 drivers/gpio/gpio-nct6694.c         |   7 -
 drivers/hwmon/nct6694-hwmon.c       |  21 -
 drivers/i2c/busses/i2c-nct6694.c    |   7 -
 drivers/mfd/Kconfig                 |  47 +-
 drivers/mfd/Makefile                |   3 +-
 drivers/mfd/nct6694-hif.c           | 663 ++++++++++++++++++++++++++++
 drivers/mfd/nct6694.c               | 111 +++--
 drivers/net/can/usb/nct6694_canfd.c |   6 -
 drivers/rtc/rtc-nct6694.c           |   7 -
 drivers/watchdog/nct6694_wdt.c      |   7 -
 include/linux/mfd/nct6694.h         |  54 ++-
 12 files changed, 813 insertions(+), 121 deletions(-)
 create mode 100644 drivers/mfd/nct6694-hif.c

-- 
2.34.1