linux-kernel - Re: [PATCH 2/3] hwmon: Add support for SPD5118 compliant temperature sensors

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Date: Fri, 31 May 2024 11:31:54 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Thomas Weißschuh <thomas@...ch.de>,
	linux-hwmon@...r.kernel.org, Hristo Venev <hristo@...ev.name>,
	René Rebe <rene@...ctcode.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Radu Sabau <radu.sabau@...log.com>,
	Paul Menzel <pmenzel@...gen.mpg.de>
Subject: Re: [PATCH 2/3] hwmon: Add support for SPD5118 compliant temperature
 sensors

Hi all,

> > Wolfgang seems to think it's important:

Wolfram, please.

> > https://lore.kernel.org/lkml/tdia472d4pow2osabef24y2ujkkquplfajxmmtk5pnxllsdxsz@wxzynz7llasr/
> > 
> 
> Ok, but that doesn't explain the reason. Wolfram, Paul, why do you
> think this is needed ? Note that I am not opposed to adding spd
> eeprom support, but I'd like to know why I am doing it before
> I spend time on it.

A working eeprom driver is needed to get 'decode-dimms' from the
i2c-tools package working. Jean reported that EEPROM access for DDR5 is
different from DDR4, so it needs a separate driver. And
i2c_register_spd() then needs to be updated to use the new driver for
DDR5.

Happy hacking,

   Wolfram

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