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

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Message-ID: <5713bb5b-3301-46bc-b30a-d2e4c58d1036@roeck-us.net>
Date: Thu, 14 Aug 2025 05:54:26 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: nuno.sa@...log.com, 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>,
 Jonathan Corbet <corbet@....net>, Linus Walleij <linus.walleij@...aro.org>,
 Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: [PATCH 0/6] mfd: Add support for the LTC4283 Hot Swap Controller

On 8/14/25 03:52, Nuno Sá via B4 Relay 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.
> 
> 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.
> 
Nowadays I suggest that people use auxiliary drivers in such situations.

Guenter