linux-kernel - Re: [PATCH v6 05/20] dt-bindings: memory: factorise LPDDR props into SDRAM props

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Message-ID: <d084b27b-eea0-48a1-a8a6-171280bec69f@kernel.org>
Date: Wed, 10 Sep 2025 10:52:36 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Clément Le Goffic <legoffic.clement@...il.com>
Cc: Gatien Chevallier <gatien.chevallier@...s.st.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Gabriel Fernandez <gabriel.fernandez@...s.st.com>,
 Julius Werner <jwerner@...omium.org>, Will Deacon <will@...nel.org>,
 Mark Rutland <mark.rutland@....com>, Philipp Zabel <p.zabel@...gutronix.de>,
 Jonathan Corbet <corbet@....net>, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-perf-users@...r.kernel.org, linux-doc@...r.kernel.org,
 Clément Le Goffic <clement.legoffic@...s.st.com>
Subject: Re: [PATCH v6 05/20] dt-bindings: memory: factorise LPDDR props into
 SDRAM props

On 10/09/2025 10:41, Clément Le Goffic wrote:
> On 10/09/2025 09:54, Krzysztof Kozlowski wrote:
>> On Tue, Sep 09, 2025 at 12:12:12PM +0200, Clément Le Goffic wrote:
>>> From: Clément Le Goffic <clement.legoffic@...s.st.com>
>>>
>>> LPDDR and DDR bindings are SDRAM types and are likely to share the same
>>> properties (at least for density, io-width and reg).
>>> To avoid bindings duplication, factorise the properties.
>>>
>>> The compatible description has been updated because the MR (Mode
>>> registers) used to get manufacturer ID and revision ID are not present
>>> in case of DDR.
>>> Those information should be in a SPD (Serial Presence Detect) EEPROM in
>>> case of DIMM module or are known in case of soldered memory chips as
>>> they are in the datasheet of the memory chips.
>>>
>>> Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
>>
>> Is this email defunct now, that you add second SoB?
> 
> Yes, but I still want to upstream it and was thinking to keep the 
> "original" author even if it is me.
> Am I wrong here ? What should I do ?


It's fine, I just wanted to clarify this.


Best regards,
Krzysztof