Add support for Microchip EMC1812

This is the hwmon driver for EMC1812/13/14/15/33 multichannel Low-Voltage
Remote Diode Sensor Family. The chips in the family have one internal
and different numbers of external channels, ranging from 1 (EMC1812) to
4 channels (EMC1815).
Reading diodes in anti-parallel connection is supported by EMC1814, EMC1815
and EMC1833.

Signed-off-by: Marius Cristea <marius.cristea@microchip.com>
---
Changes in v6:
- driver
  - fix an overflow when writing more then 191875 to limits stored on 8
    bits register
  - remove "i2c_set_clientdata" from probe
  - fix discrepancy where writing 16ms and reading it back returns 15ms
    at update interval
  - skip setting the ideality factor for channels that are not available
    on the device
- devicetree binding:
  - change the way interrupts are described/used
  - add "microchip,enable-anti-parallel"
  - rewrite "allOf" section to be more clear
- Link to v5: https://lore.kernel.org/r/20260205-hw_mon-emc1812-v5-0-23...

Changes in v5:
- fix calculation in emc1812_get_limit_temp 
- use i2c_get_match_data cover the case when the driver is instantiated
  via I2C ID table.
- replace dev_info with dev_warn
- remove some unnecessary truncation on 8 bits
- remove clamping when reading the temerature with hyst
- not change the conversion rate at probe time
- use a generic define to remove duplicate channel_info entries
- Link to v4: https://lore.kernel.org/r/20260127-hw_mon-emc1812-v4-0-6b...

Changes in v4:
- fix file permissions for read only properties
- fix calculation when the limits are written
- remove the temp_min_hyst because the part doesn't support it
- Link to v3: https://lore.kernel.org/r/20251218-hw_mon-emc1812-v3-0-a1...

Changes in v3:
- remove mesages that are not helpfull
- fix an issue related to NULL labels
- fix sign/unsign calculation
- replace E2BIG with EINVAL
- use BIT() to create mask
- Link to v2: https://lore.kernel.org/r/20251121-hw_mon-emc1812-v2-0-5b...

Changes in v2:
- update the interrupt section from yaml file
- update index.rst
- remove fault condition from internal sensor
- remove unused members from structures
- update the driver to work on systems without device tree or
  firmware nodes
- add missing include files
- make NULL labels to be not visible
- corect sign/unsign calculations
- corect possible underflow for limits
- Link to v1: https://lore.kernel.org/r/20251029-hw_mon-emc1812-v1-0-be...

---
Marius Cristea (2):
      dt-bindings: hwmon: temperature: add support for EMC1812
      hwmon: temperature: add support for EMC1812

 .../bindings/hwmon/microchip,emc1812.yaml          | 196 +++++
 Documentation/hwmon/emc1812.rst                    |  68 ++
 Documentation/hwmon/index.rst                      |   1 +
 MAINTAINERS                                        |   8 +
 drivers/hwmon/Kconfig                              |  11 +
 drivers/hwmon/Makefile                             |   1 +
 drivers/hwmon/emc1812.c                            | 942 +++++++++++++++++++++
 7 files changed, 1227 insertions(+)
---
base-commit: d2b2fea3503e5e12b2e28784152937e48bcca6ff
change-id: 20251002-hw_mon-emc1812-f1b806487d10

Best regards,
-- 
Marius Cristea <marius.cristea@microchip.com>