linux-kernel - Re: [PATCH v9 2/7] dt-bindings: memory: introduce DDR4

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Message-ID: <176365062162.1254978.3113045721070075271.robh@kernel.org>
Date: Thu, 20 Nov 2025 08:57:02 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Clément Le Goffic <legoffic.clement@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	linux-stm32@...md-mailman.stormreply.com,
	Conor Dooley <conor+dt@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Julius Werner <jwerner@...omium.org>, linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	devicetree@...r.kernel.org,
	Clément Le Goffic <clement.legoffic@...s.st.com>
Subject: Re: [PATCH v9 2/7] dt-bindings: memory: introduce DDR4


On Tue, 18 Nov 2025 16:07:58 +0100, Clément Le Goffic wrote:
> From: Clément Le Goffic <clement.legoffic@...s.st.com>
> 
> Introduce JEDEC compliant DDR bindings, that use new memory-props binding.
> 
> The DDR4 compatible can be made of explicit vendor names and part
> numbers or be of the form "ddrX-YYYY,AAAA...-ZZ" when associated with an
> SPD, where (according to JEDEC SPD4.1.2.L-6):
> - YYYY is the manufacturer ID
> - AAAA... is the part number
> - ZZ is the revision ID
> 
> The former form is useful when the SDRAM vendor and part number are
> known, for example, when memory is soldered on the board.
> The latter form is useful when SDRAM nodes are created at runtime by
> boot firmware that doesn't have access to static part number information.
> 
> Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
> Signed-off-by: Clément Le Goffic <legoffic.clement@...il.com>
> ---
>  .../memory-controllers/ddr/jedec,ddr4.yaml         | 34 ++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>