linux-kernel - Re: [PATCH v8 2/7] dt-bindings: memory: introduce DDR4

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Message-ID: <b3accac0-d02a-4b92-848c-ada62377e440@gmail.com>
Date: Fri, 24 Oct 2025 11:21:25 +0200
From: Clément Le Goffic <legoffic.clement@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Julius Werner <jwerner@...omium.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc: 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 v8 2/7] dt-bindings: memory: introduce DDR4

On 10/23/25 15:21, Krzysztof Kozlowski wrote:
> On 30/09/2025 10:46, Clément Le Goffic wrote:
>> From: Clément Le Goffic <clement.legoffic@...s.st.com>
>>
>> Introduce JEDEC compliant DDR bindings, that use new memory-props binding.
> 
> 
> If there is going to be resend, then please repeat here applicable part
> of compatible format, e.g. why it's like that.

Hi Krzysztof, ok

> 
>>
>> 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(+)
>>
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml
>> new file mode 100644
>> index 000000000000..a2eb6f63c0ce
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/memory-controllers/ddr/jedec,ddr4.yaml
>> @@ -0,0 +1,34 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,ddr4.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: DDR4 SDRAM compliant to JEDEC JESD79-4D
>> +
>> +maintainers:
>> +  - Krzysztof Kozlowski <krzk@...nel.org>
>> +
>> +allOf:
>> +  - $ref: jedec,sdram-props.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - pattern: "^ddr4-[0-9a-f]{4},[a-z]{1,20},[0-9a-f]{2}$"
> 
> Why double ','? I would imagine last ',' to be '-':
> ddrX-YYYY,AAAA...-ZZ
> 
> Sorry if we discuss that already, but then please remind me and this
> would need addressing in commit msg.

I do not see anything against that.
I'll wait Julius's review, if any, and I will send the next version with 
this changes.

> 
>> +      - const: jedec,ddr4
> 
> 
> Best regards,
> Krzysztof