linux-kernel - Re: [PATCH v4 5/6] i2c: smbus: Support DDR5 SPD EEPROMs

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Message-ID: <c3771889-8bc9-40ba-be14-cb666a0ef154@roeck-us.net>
Date: Tue, 18 Jun 2024 08:43:30 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Paul Menzel <pmenzel@...gen.mpg.de>
Cc: linux-hwmon@...r.kernel.org, linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>,
 René Rebe <rene@...ctcode.de>,
 Thomas Weißschuh <linux@...ssschuh.net>,
 Armin Wolf <W_Armin@....de>, Stephen Horvath <s.horvath@...look.com.au>
Subject: Re: [PATCH v4 5/6] i2c: smbus: Support DDR5 SPD EEPROMs

On 6/18/24 08:25, Paul Menzel wrote:

[ ... ]

>> sudo bash -c 'echo 56000 > /sys/class/hwmon/hwmon3/temp1_max'
> 
>      $ sudo bash -c 'echo 56000 > /sys/class/hwmon/hwmon3/temp1_max'
>      bash: line 1: echo: write error: No such device or address
> 

So, as I suspected, that means that all write operations fail,
meaning the write operation used by regmap is not supported by
the chip and/or by the i2c controller.

That makes me wonder if the same problem is seen with other variants
of the same problem. If so, we may have to drop regmap support
completely.

Does anyone else of those listening in have a Intel/i801 system
and could possibly test if they have the same problem ?

Thanks,
Guenter