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Wed, 23 Jul 2025 09:33:25 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 249E640046; Wed, 23 Jul 2025 09:32:06 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node2.st.com [10.75.129.70]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 14599768F12; Wed, 23 Jul 2025 09:30:48 +0200 (CEST) Received: from [10.48.86.185] (10.48.86.185) by SHFDAG1NODE2.st.com (10.75.129.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 23 Jul 2025 09:30:47 +0200 Message-ID: <3e59d670-ee96-4ff2-a6c6-99d8a030e16c@foss.st.com> Date: Wed, 23 Jul 2025 09:30:46 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 06/19] dt-bindings: memory: introduce DDR4 To: Julius Werner CC: Will Deacon , Mark Rutland , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Philipp Zabel , Jonathan Corbet , Gatien Chevallier , Michael Turquette , Stephen Boyd , Gabriel Fernandez , Krzysztof Kozlowski , Le Goffic , , , , , , , References: <20250722-ddrperfm-upstream-v3-0-7b7a4f3dc8a0@foss.st.com> <20250722-ddrperfm-upstream-v3-6-7b7a4f3dc8a0@foss.st.com> Content-Language: en-US From: Clement LE GOFFIC In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.48.86.185] X-ClientProxiedBy: SHFCAS1NODE2.st.com (10.75.129.73) To SHFDAG1NODE2.st.com (10.75.129.70) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-23_01,2025-07-22_01,2025-03-28_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250723_003336_534753_AA545CEC X-CRM114-Status: GOOD ( 10.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Julius, On 7/22/25 23:57, Julius Werner wrote: >> + - pattern: "^ddr4-[0-9a-f]{2},[0-9a-f]{4}$" > > This pattern doesn't really make sense when DDR4 doesn't have the same > manufacturer ID / revision ID format as LPDDR. You could either only > leave the fallback constant for now, or define a new auto-generated > format that matches what DDR4 SPD provides (which I believe, if I read > Wikipedia right, is a two byte manufacturer ID and then an up to 20 > character ASCII part number string -- so it could be > `^ddr4-[0-9a-f{2},[0-9A-Za-z]{1,20}$`). Oh ok I didn't catch that it should be from the SPD. I'll propose something. Best regards, Clément