linux-kernel - Re: [PATCH v2 1/2] hwmon: (pmbus) Add support for MPS multi-phase mp2869a/mp29612a controllers

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Message-ID: <6a72e973-a142-4592-9b11-908a49f8df13@roeck-us.net>
Date: Wed, 16 Jul 2025 16:52:22 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: tzuhao.wtmh@...il.com, 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>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Naresh Solanki <naresh.solanki@...ements.com>,
 Rodrigo Gobbi <rodrigo.gobbi.7@...il.com>, Fabio Estevam
 <festevam@...il.com>, Michal Simek <michal.simek@....com>,
 Henry Wu <Henry_Wu@...ntatw.com>, Grant Peltier <grantpeltier93@...il.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Cedric Encarnacion <cedricjustine.encarnacion@...log.com>,
 Nuno Sa <nuno.sa@...log.com>, Cherrence Sarip <cherrence.sarip@...log.com>,
 Jerome Brunet <jbrunet@...libre.com>, Leo Yang <leo.yang.sy0@...il.com>,
 John Erasmus Mari Geronimo <johnerasmusmari.geronimo@...log.com>,
 Kim Seer Paller <kimseer.paller@...log.com>,
 Alex Vdovydchenko <xzeol@...oo.com>, Ninad Palsule <ninad@...ux.ibm.com>,
 Mariel Tinaco <Mariel.Tinaco@...log.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
 linux-doc@...r.kernel.org
Cc: peteryin.openbmc@...il.com, Wensheng Wang <wenswang@...h.net>
Subject: Re: [PATCH v2 1/2] hwmon: (pmbus) Add support for MPS multi-phase
 mp2869a/mp29612a controllers

On 6/30/25 04:20, tzuhao.wtmh@...il.com wrote:
> From: Henry Wu <Henry_Wu@...ntatw.com>
> 
> Add support for the mp2869a and mp29612a controllers from Monolithic Power
> Systems, Inc. (MPS). These are dual-loop, digital, multi-phase modulation
> controllers.
> 

This patch needs to be consolidated with the MP2869 part of
https://patchwork.kernel.org/project/linux-hwmon/patch/20250709093420.456304-2-wenswang@yeah.net/
That patch uses the _identify function from the PMBus core instead of re-implementing
it, which is a plus. It also takes more chip configuration details into account.
But then it only supports mp2869 and not mp2869a or mp29612a.

The chips do not officially exist, so I have a difficult time to determine
what is actually needed or even makes sense. You'll have to determine that
with the submitter of the other driver.

Frankly, I am not even sure if I should accept drivers for chips which are
so super-secret that the manufacturer does not even admit their existence.

Guenter