linux-kernel - Re: [PATCH v7 2/7] dt-bindings: memory: introduce DDR4

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Message-ID: <430e9fad-a877-4328-848f-59b982a10706@gmail.com>
Date: Wed, 24 Sep 2025 12:00:17 +0200
From: Clément Le Goffic <legoffic.clement@...il.com>
To: Julius Werner <jwerner@...omium.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org,
 Clément Le Goffic <clement.legoffic@...s.st.com>
Subject: Re: [PATCH v7 2/7] dt-bindings: memory: introduce DDR4

On 23/09/2025 00:51, Julius Werner wrote:
>> +      - pattern: "^ddr4-[0-9a-f]{4},[a-z]{1,10},[0-9a-f]{2}$"
> 
> I don't really understand why there can only be up to 10 characters in
> the module part number. I also don't understand why you wrote "20
> bytes (10 chars)" for this in the previous patch. Are you assuming
> that module part numbers are UTF16LE? According to my reading of the
> spec, it sounds like they're supposed to be plain ASCII, i.e. 20 bytes
> should be able to contain up to 20 chars.

Hi Julius,

Yes plain ASCII needs 8 bits for each char as the value range is 0-127
I was having hexadecimal in mind while writing this, I'm sorry.
I'll fix it here and in the previous patch.

Best regards,
Clément