[PATCH v3 0/3] Add support for STMicroelectronics M24LR EEPROM/NFC chips

[Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>]

This patch series adds support for the STMicroelectronics M24LR series
RFID/NFC EEPROM devices. These chips expose two I2C addresses: the primary
one provides access to system control and configuration registers, while
the secondary address is used for EEPROM access.

The driver implements both functionalities:
 - A sysfs-based interface for the control and system parameter registers.
 - EEPROM access via the nvmem subsystem using a secondary I2C dummy client.

Brief summary of changes in v3:
 - Full support for ST M24LR chips, including integrated EEPROM access
   within the same driver-no need for the at24 driver.
 - Dropped usage of the I2C mux API.
 - Switched to using the NVMEM subsystem for EEPROM access.
 - Removed reference to the i2c-mux binding.
 - Added reference to the nvmem binding to reflect EEPROM integration.
 - Updated the reg property to support devices exposing two I2C
   addresses, one for control and one for EEPROM.

Tested on: M24LR04E-R using Yocto on Raspberry Pi 4

Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>

Abd-Alrhman Masalkhi (3):
  dt-bindings: eeprom: Add ST M24LR support
  misc: add driver for ST M24LR series RFID/NFC EEPROM chips
  ABI: sysfs: add documentation for ST M24LR EEPROM and control
    interface

 .../ABI/testing/sysfs-bus-i2c-devices-m24lr   |  96 +++
 .../devicetree/bindings/misc/st,m24lr.yaml    |  54 ++
 drivers/misc/Kconfig                          |  17 +
 drivers/misc/Makefile                         |   1 +
 drivers/misc/m24lr.c                          | 705 ++++++++++++++++++
 5 files changed, 873 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-i2c-devices-m24lr
 create mode 100644 Documentation/devicetree/bindings/misc/st,m24lr.yaml
 create mode 100644 drivers/misc/m24lr.c

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2.43.0