[PATCH v2 0/6] hwmon: (adt7470) Add thermal zone and PWM provider support

[Luiz Angelo Daros de Luca <luizluca@gmail.com>]

The ADT7470 is a temperature monitor and PWM fan controller capable of
monitoring up to 10 external temperature sensors and controlling up to 4
PWM outputs.

Currently, the driver exposes these sensors and PWM controls solely via
the standard hwmon sysfs interface. This patch series integrates the
ADT7470 driver with the kernel's thermal and PWM subsystems. This allows
its temperature sensors to be referenced by Device Tree thermal zones,
and its PWM channels to be consumed by generic Device Tree nodes (such
as "pwm-fan").

Patch 1 adds the YAML device tree binding documentation.
Patch 2 and 3 fix two pre-existing bugs found while testing this series
(fans stuck in manual mode after an I2C error, and a
busy-loop/I2C-flooding condition when auto_update_interval or
num_temp_sensors is 0).
Patch 4 performs a minor refactoring to introduce the ADT7470_PWM_MAX
macro.
Patch 5 registers the 4 PWM channels as a generic PWM provider.
Patch 6 registers the external temperature sensors as optional thermal
zones.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

---
Changes in v2:
- Fixed 2 previous bugs uncovered by Sashiko-bot during review.
- Dropped the thermal cooling device registration for the PWM channels.
- Implemented generic PWM provider support using the PWM subsystem.
- Updated Kconfig to safely handle the PWM subsystem dependency (depends on PWM || PWM=n).
- Updated Device Tree bindings to require #pwm-cells instead of #cooling-cells.
- Link to v1: https://patch.msgid.link/20260716-adt7470_thermalzone-v1-0-cc55ef35edde@gmail.com

To: Guenter Roeck <linux@roeck-us.net>
To: Rob Herring <robh@kernel.org>
To: Krzysztof Kozlowski <krzk+dt@kernel.org>
To: Conor Dooley <conor+dt@kernel.org>
To: de Luca <luizluca@gmail.com>
To: Chris Packham <chris.packham@alliedtelesis.co.nz>
To: Andrew Morton <akpm@linux-foundation.org>
To: "Darrick J. Wong" <djwong@us.ibm.com>
To: Uwe Kleine-König <ukleinek@kernel.org>
Cc: linux-hwmon@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pwm@vger.kernel.org

---
Luiz Angelo Daros de Luca (6):
      dt-bindings: hwmon: add binding for adi,adt7470
      hwmon: (adt7470) Fix fans stuck in manual mode on I2C errors
      hwmon: (adt7470) Fix busy-loop and I2C flooding in update thread
      hwmon: (adt7470) Add ADT7470_PWM_MAX macro
      hwmon: (adt7470) Register as a PWM provider
      hwmon: (adt7470) Add thermal zone sensor support

 .../devicetree/bindings/hwmon/adi,adt7470.yaml     |  62 +++++++++++
 drivers/hwmon/Kconfig                              |   1 +
 drivers/hwmon/adt7470.c                            | 118 ++++++++++++++++++---
 3 files changed, 166 insertions(+), 15 deletions(-)
---
base-commit: ca078d004cf58137bcf8cb24a8b271397431ba58
change-id: 20260716-adt7470_thermalzone-59a102278d72

Best regards,
--  
Luiz Angelo Daros de Luca <luizluca@gmail.com>