linux-kernel - Re: [PATCH v3 06/19] dt-bindings: memory: introduce DDR4

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Message-ID: <CAODwPW_7aYdEzdUJ7b2nT4-zS9bu_hbNqjc7+_wSHbedXZXJ=Q@mail.gmail.com>
Date: Tue, 22 Jul 2025 14:57:48 -0700
From: Julius Werner <jwerner@...omium.org>
To: Clément Le Goffic <clement.legoffic@...s.st.com>
Cc: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Jonathan Corbet <corbet@....net>, 
	Gatien Chevallier <gatien.chevallier@...s.st.com>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Gabriel Fernandez <gabriel.fernandez@...s.st.com>, 
	Krzysztof Kozlowski <krzk@...nel.org>, Le Goffic <legoffic.clement@...il.com>, 
	Julius Werner <jwerner@...omium.org>, linux-arm-kernel@...ts.infradead.org, 
	linux-perf-users@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, linux-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 06/19] dt-bindings: memory: introduce DDR4

> +      - pattern: "^ddr4-[0-9a-f]{2},[0-9a-f]{4}$"

This pattern doesn't really make sense when DDR4 doesn't have the same
manufacturer ID / revision ID format as LPDDR. You could either only
leave the fallback constant for now, or define a new auto-generated
format that matches what DDR4 SPD provides (which I believe, if I read
Wikipedia right, is a two byte manufacturer ID and then an up to 20
character ASCII part number string -- so it could be
`^ddr4-[0-9a-f{2},[0-9A-Za-z]{1,20}$`).