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Thu, 16 Jul 2026 00:54:21 -0500 Received: from [10.24.52.55] (santhoshkumark.dhcp.ti.com [10.24.52.55]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 66G5sG4F041780; Thu, 16 Jul 2026 00:54:16 -0500 Message-ID: <45821dff-720b-43ac-899e-03f200d48b9d@ti.com> Date: Thu, 16 Jul 2026 11:24:15 +0530 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 02/16] spi: dt-bindings: add spi-phy-pattern-partition property To: Miquel Raynal , Krzysztof Kozlowski CC: , , , , , , , , , , , , , , , , References: <20260618073725.84733-1-s-k6@ti.com> <20260618073725.84733-3-s-k6@ti.com> <20260622-jasmine-mandrill-of-emphasis-eebb4c@quoll> <87zf0m5wlx.fsf@bootlin.com> Content-Language: en-US From: Santhosh Kumar K In-Reply-To: <87zf0m5wlx.fsf@bootlin.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000252A3:EE_|CY5PR10MB6120:EE_ X-MS-Office365-Filtering-Correlation-Id: 76f0c414-94b3-4c7c-c962-08dee2feb8c0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|7416014|376014|1800799024|82310400026|23010399003|56012099006|4143699003|6133799003|10067099003|18002099003|22082099003; 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On 22/06/26 22:41, Miquel Raynal wrote: > Hello, > >>> + spi-phy-pattern-partition: >> >> Is this specific to SPI-based MTD/NAND or rather broader - specific to >> MTD/NAND memories, regardless of interface? Feels like the second, thus >> maybe should be placed into the NAND bindings. >> >> If the first, then in below description: >> >> s/PHY/SPI PHY/ to be clear that this is about SPI, not the memory >> itself. > > As far as I know, there is no raw NAND controller with such > capability. In the raw/parallel NAND world, timings are well defined by > the ONFI specification, it covers both the bus timings and the minimal > requirements for the chips. There is a method to query what "timing mode" > the NAND chip supports, and then we tune the controller registers to fit > the highest supported timings (capped by possible controller limits). > > In the SPI world it is different. No specific timing has ever been > globally defined, so every manufacturer has its own capabilities which > are not discoverable dynamically. The routing also weights a lot. I > would say that we can safely keep this property SPI related, because it > is about the SPI bus being used with optimized timings, rather than some > kind of memory specific feature. > > The reason why we need a property in those memories for the feature to > work, is because we need to make data transfers with a known pattern, > thus requiring to read the pattern from the internal array somehow. > > Therefore, we shall indeed go for the s/PHY/SPI PHY/ naming indeed. Agreed, will replace 'PHY' with 'SPI PHY' in the description. Thanks, Santhosh. > > Thanks, > Miquèl