linux-kernel - [PATCH v2 0/2] Add support for HiTRON HAC300S PSU

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Message-ID: <20260119190806.35276-1-vassilisamir@gmail.com>
Date: Mon, 19 Jan 2026 20:08:04 +0100
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	linux@...ck-us.net
Cc: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Vasileios Amoiridis <vasileios.amoiridis@...n.ch>
Subject: [PATCH v2 0/2] Add support for HiTRON HAC300S PSU

From: Vasileios Amoiridis <vasileios.amoiridis@...n.ch>

Changes in v2:
--------------

Patch 1/2:
	- fixed type
	- Added Ack-By

Patch 2/2:
	- removed if statement for VOUT_MODE reg
	- device specific read_word_data function reads only affected
	  registers and returns -ENODATA
	- fixed typos

v1:
---

Add support for the HiTRON HAC300S AC/DC switching power supply in
compact PCI format, with a 300W rating. This is a simple PMBUS
compatible device.

There is a small caveat with the internal registers of the device and
more specifically with the PMBUS_VOUT_MODE. As it is already described
in the driver, the device does not support the PMBUS_VOUT_MODE register
and at the same time, it returns the voltage output values in Linear11
which is not adhering to the PMBus specification (PMBus Specification
Part II, Section 7.1-7.3). For that reason the PMBUS_VOUT_MODE register
is being faked and returns the exponent value of the READ_VOUT register.
The exponent part of the VOUT_* registers is being cleard in order to
return the mantissa to the pmbus core.

Vasileios Amoiridis (2):
  dt-bindings: trivial-devices: Add hitron,hac300s
  hwmon: Add support for HiTRON HAC300S PSU

 .../devicetree/bindings/trivial-devices.yaml  |   2 +
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 Documentation/hwmon/hac300s.rst               |  37 +++++
 Documentation/hwmon/index.rst                 |   1 +
 MAINTAINERS                                   |   7 +
 drivers/hwmon/pmbus/Kconfig                   |   9 ++
 drivers/hwmon/pmbus/Makefile                  |   1 +
 drivers/hwmon/pmbus/hac300s.c                 | 132 ++++++++++++++++++
 8 files changed, 191 insertions(+)
 create mode 100644 Documentation/hwmon/hac300s.rst
 create mode 100644 drivers/hwmon/pmbus/hac300s.c

-- 
2.47.3