linux-kernel - [PATCH v2 0/2] Add driver support for ESWIN EIC7700 PVT controller

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Message-Id: <20260128101400.859-1-hehuan1@eswincomputing.com>
Date: Wed, 28 Jan 2026 18:14:00 +0800
From: hehuan1@...incomputing.com
To: linux@...ck-us.net,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	p.zabel@...gutronix.de,
	linux-hwmon@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: ningyu@...incomputing.com,
	linmin@...incomputing.com,
	pinkesh.vaghela@...fochips.com,
	luyulin@...incomputing.com,
	Huan He <hehuan1@...incomputing.com>
Subject: [PATCH v2 0/2] Add driver support for ESWIN EIC7700 PVT controller

From: Huan He <hehuan1@...incomputing.com>

Add support for the ESWIN EIC7700 PVT (Process, Voltage, Temperature)
sensor

Features:
The driver supports monitoring of process, voltage and temperature
parameters through the hardware monitoring subsystem. It provides an
access to the sampled Temperature and Voltage.

Test:
Tested this patch on the SiFive HiFive Premier P550 (which uses the ESWIN
EIC7700 SoC).

Updates:

  Changes in v2:
  - Update eswin,eic7700-pvt.yaml
    - Reference the hwmon-common.yaml file
    - Remove the clock-names and reset-names properties
    - Move additionalProperties: false after the required block
    - Remove one example node to avoid redundancy
  - Update eic7700-pvt.c and eic7700-pvt.h
    - Remove unused sensor macros (PVT_SENSOR_FIRST, PVT_SENSOR_LAST,
      PVT_SENSORS_NUM)
    - Drop the unnecessary hwmon-sysfs.h header
    - Replace dynamic sensor info allocation with a static array and unify
      sensor labels
    - Remove unused hwmon_temp_type attribute
    - Eliminate redundant validation checks
    - Remove mutex and related locking, relying on hwmon core
      serialization
    - Replace per-sensor caches and completions with a single data cache
      and completion object
    - Remove pvt->sensor tracking. ISR no longer depends on the currently
      selected sensor
    - Move devm_add_action() registration after init_completion() for
      safer cleanup, and update cleanup function (pvt_clear_data)
    - Replace devm_reset_control_get_optional_exclusive() with
      devm_reset_control_get_exclusive_deasserted()
    - Replace eic7700_pvt_remove() with eic7700_pvt_disable_pm_runtime()
      and move it after PM runtime enable to avoid resource leaks on probe
      failure and remove clock disable and reset assert from
      eic7700_pvt_disable_pm_runtime() as it is already handled by devm_*
      framework
    - Remove redundant clock presence check in runtime_resume

  - Link to v1: https://lore.kernel.org/all/20260109090718.442-1-hehuan1@eswincomputing.com/

Huan He (2):
  dt-bindings: hwmon: Add Eswin EIC7700 PVT sensor
  hwmon: Add Eswin EIC7700 PVT sensor driver

 .../bindings/hwmon/eswin,eic7700-pvt.yaml     |  70 ++
 drivers/hwmon/Kconfig                         |  12 +
 drivers/hwmon/Makefile                        |   1 +
 drivers/hwmon/eic7700-pvt.c                   | 612 ++++++++++++++++++
 drivers/hwmon/eic7700-pvt.h                   | 106 +++
 5 files changed, 801 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/eswin,eic7700-pvt.yaml
 create mode 100644 drivers/hwmon/eic7700-pvt.c
 create mode 100644 drivers/hwmon/eic7700-pvt.h

-- 
2.25.1