linux-kernel - [PATCH 0/6] mfd: Add support for the LTC4283 Hot Swap Controller

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Message-Id: <20250814-ltc4283-support-v1-0-88b2cef773f2@analog.com>
Date: Thu, 14 Aug 2025 11:52:22 +0100
From: Nuno Sá via B4 Relay <devnull+nuno.sa.analog.com@...nel.org>
To: linux-hwmon@...r.kernel.org, linux-gpio@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-doc@...r.kernel.org
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Jean Delvare <jdelvare@...e.com>, 
 Guenter Roeck <linux@...ck-us.net>, Jonathan Corbet <corbet@....net>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH 0/6] mfd: Add support for the LTC4283 Hot Swap Controller

The LTC4283 device features programmable current limit with foldback and
independently adjustable inrush current to optimize the MOSFET safe
operating area (SOA). The SOA timer limits MOSFET temperature rise for
reliable protection against overstresses.

An I2C interface and onboard ADC allow monitoring of board current, voltage,
power, energy, and fault status.

It also features 8 pins that can be configured as GPIO devices. But since
the main usage for this device is monitoring, the GPIO part is optional
while the HWMON is being made as required.

Also to note that the device has some similarities with the already
supported ltc4282 hwmon driver but it is different enough to be in it's own
driver (apart from being added as MFD). The register map is also fairly
different.

Last time (for the ltc4282) I tried to add the gpio bits directly in the
hwmon driver but Guenter did not really liked it and so this time I'm doing
it as MFD.
 

---
Nuno Sá (6):
      dt-binbings: mfd: Add bindings for the LTC4283 Swap Controller
      mfd: ltc4283: Add support for the LTC4283 Swap Controller
      dt-binbings: hwmon: Add bindings for the LTC4283 Swap Controller
      hwmon: ltc4283-hwmon: Add support for the LTC4283 Swap Controller
      dt-binbings: gpio: Add bindings for the LTC4283 Swap Controller
      gpio: gpio-ltc4283: Add support for the LTC4283 Swap Controller

 .../devicetree/bindings/gpio/adi,ltc4283.yaml      |   33 +
 .../devicetree/bindings/hwmon/adi,ltc4283.yaml     |  159 ++
 .../devicetree/bindings/mfd/adi,ltc4283.yaml       |   85 +
 Documentation/hwmon/ltc4283.rst                    |  266 ++++
 MAINTAINERS                                        |   13 +
 drivers/gpio/Kconfig                               |   10 +
 drivers/gpio/Makefile                              |    1 +
 drivers/gpio/gpio-ltc4283.c                        |  233 +++
 drivers/hwmon/Kconfig                              |   10 +
 drivers/hwmon/Makefile                             |    1 +
 drivers/hwmon/ltc4283-hwmon.c                      | 1658 ++++++++++++++++++++
 drivers/mfd/Kconfig                                |   11 +
 drivers/mfd/Makefile                               |    1 +
 drivers/mfd/ltc4283.c                              |  140 ++
 include/linux/mfd/ltc4283.h                        |   33 +
 15 files changed, 2654 insertions(+)
---
base-commit: 9703c672af8dd3573c76ce509dfff26bf6c4768d
change-id: 20250812-ltc4283-support-27c8c4e69c6b
--

Thanks!
- Nuno Sá