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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CACRpkdYWNgU8PxVaxDe3F6Cbb15J5cgEV1-kgDooOHdBoXXs3g@mail.gmail.com>
Date: Tue, 19 Aug 2025 14:36:52 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: nuno.sa@...log.com, Jonathan Cameron <jic23@...nel.org>
Cc: linux-hwmon@...r.kernel.org, linux-gpio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org, 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>, 
	Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: [PATCH 0/6] mfd: Add support for the LTC4283 Hot Swap Controller

On Thu, Aug 14, 2025 at 12:52 PM Nuno Sá via B4 Relay
<devnull+nuno.sa.analog.com@...nel.org> wrote:

> 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.

This main device just screams Industrial I/O, IIO.

(I think it's fine to use an MFD core and split off GPIO to a
separate driver, and I suggest maybe you merge MFD and
GPIO ahead of the main driver.)

Jonathan (Cameron) will have the last word on it but IMO this firmly
belongs below drivers/iio.

Perhaps not in one of the existing subdirs there but then it is time to
be brave and create a new one.

It will take some time and consideration, but I think it would be better
for everyone.

Yours,
Linus Walleij