linux-kernel - [PATCH v3 0/3] hwmon: add Microchip EMC2101 driver

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Message-Id: <20250709164829.3072944-1-noltari@gmail.com>
Date: Wed,  9 Jul 2025 18:48:26 +0200
From: Álvaro Fernández Rojas <noltari@...il.com>
To: jdelvare@...e.com,
	linux@...ck-us.net,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	corbet@....net,
	linux-hwmon@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org
Cc: Álvaro Fernández Rojas <noltari@...il.com>
Subject: [PATCH v3 0/3] hwmon: add Microchip EMC2101 driver

The Microchip EMC2101 is a SMBus 2.0 fan controller with temperature
monitoring.

It supports up to 1 fan, 1 internal temperature sensor, 1 external
temperature sensor and an 8 entry look up table to create a
programmable temperature response.

v3: multiple improvements:
 - rst: drop emc2101-r (same chip, loads config from EEPROM).
 - dt: fix errors, remove patternProperties and drop emc2101-r.
 - Switch to regmap-i2c.
 - Use regmap fields.
 - Add Power Management support.
 - Demote dev_info() to dev_dbg().
 - Remove "emc2101-r" i2c_device_id.
 - Remove "microchip,emc2101-r" of_device_id.
 - Properly implement standby mode.
 - Use milliseconds instead of millihertz for update_interval.
 - Drop mutex except for FAN_LUT_DISABLE and TEMP_EXT_CRIT_UNLOCK.
 - Fix u16 fraction temperature conversions.
 - Other code cleanups and refactors.

v2: multiple improvements:
 - add emc2101.rst to index.rst.
 - add missing documentation properties.
 - Remove FAN_RPM_MIN definition.
 - Rename FAN_FALSE_READ to FAN_MIN_READ.
 - pwm_auto_point_temp_hyst_store(): simplify function.
 - emc2101_fan_min_read(): add missing FAN_MIN_READ condition.
 - emc2101_fan_min_write(): fix tach_count calculation.
 - emc2101_init(): fix REG_TACH_MIN value.

Álvaro Fernández Rojas (3):
  docs: hwmon: add emc2101.rst to docs
  dt-bindings: hwmon: Add Microchip EMC2101 support
  drivers: hwmon: add EMC2101 driver

 .../bindings/hwmon/microchip,emc2101.yaml     |   59 +
 Documentation/hwmon/emc2101.rst               |   61 +
 Documentation/hwmon/index.rst                 |    1 +
 drivers/hwmon/Kconfig                         |   11 +
 drivers/hwmon/Makefile                        |    1 +
 drivers/hwmon/emc2101.c                       | 2176 +++++++++++++++++
 6 files changed, 2309 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/microchip,emc2101.yaml
 create mode 100644 Documentation/hwmon/emc2101.rst
 create mode 100644 drivers/hwmon/emc2101.c

-- 
2.39.5