linux-kernel - Re: [PATCH v3 07/19] dt-bindings: memory: factorise LPDDR channel binding into memory channel

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Message-ID: <608d03ef-1017-4f82-b7b0-a461c35b59a2@foss.st.com>
Date: Wed, 23 Jul 2025 10:14:12 +0200
From: Clement LE GOFFIC <clement.legoffic@...s.st.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
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>,
        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 07/19] dt-bindings: memory: factorise LPDDR channel
 binding into memory channel

Hi,

On 7/23/25 09:06, Krzysztof Kozlowski wrote:
> On 23/07/2025 08:57, Krzysztof Kozlowski wrote:
>> On Tue, Jul 22, 2025 at 04:03:24PM +0200, Clément Le Goffic wrote:
>>> LPDDR and DDR channels exist and share the same properties, they have a
>>> compatible, ranks, and an io-width.
>>
>> Maybe it is true for all types of SDRAM, like RDRAM and eDRAM, but I
> 
> 
> Although these were not JEDEC probably...

Hmm so no "sdram-channel" ?
I don't get your point here.

> 
>> don't think all memory types do.
>>
>> I think this should be renamed to sdram-channel.
> ... yet still JEDEC also has some standards for SRAM, EPROM, HBM and
> SGRAM (graphics), see:
> https://www.jedec.org/category/technology-focus-area/memory-configurations-jesd21-c

In a more generic point of view we can think compatible, density and io- 
width as common for all sort of memory no ?

> 
> Best regards,
> Krzysztof