linux-kernel - Re: [PATCH v2 2/2] hwmon: pmbus: add driver for ltp8800-1a, ltp8800-4a, and ltp8800-2

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Message-ID: <697a9596-f5aa-48d0-ad26-ebe06b831ee8@roeck-us.net>
Date: Wed, 6 Nov 2024 17:45:22 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Cedric Encarnacion <cedricjustine.encarnacion@...log.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-hwmon@...r.kernel.org
Cc: Jean Delvare <jdelvare@...e.com>, Jonathan Corbet <corbet@....net>,
 Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>, Rob Herring
 <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Peter Yin <peteryin.openbmc@...il.com>,
 Noah Wang <noahwang.wang@...look.com>, Marek Vasut <marex@...x.de>,
 Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH v2 2/2] hwmon: pmbus: add driver for ltp8800-1a,
 ltp8800-4a, and ltp8800-2

On 11/5/24 19:09, Cedric Encarnacion wrote:
> LTP8800-1A 54V, 150A DC/DC µModule Regulator with PMBus Interface
> LTP8800-4A 54V, 200A DC/DC µModule Regulator with PMBus Interface
> LTP8800-2 54V, 135A DC/DC μModule Regulator with PMBus Interface
> 
> The LTP8800 is a family of step-down μModule regulators that provides
> microprocessor core voltage from 54V power distribution architecture. It
> features telemetry monitoring of input/output voltage, input current,
> output power, and temperature over PMBus.
> 
> Signed-off-by: Cedric Encarnacion <cedricjustine.encarnacion@...log.com>

Looking closer into the datasheets, I found that the PMBus commands are identical
to those of ADP1055, and an extension of the ADP1050 driver to support ADP1055
has been submitted.

With this in mind, please explain why this series warrants a new driver instead
of just extending the existing driver to support LTP8800.

Thanks,
Guenter