From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D7450C43458 for ; Thu, 2 Jul 2026 16:37:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=JYz2t9rOB6Xr/OOk1r6hBAPIGizcFH6efsw9sdj+Wuk=; b=QYOVRxeJh7xYrJEUXc6KVJkyOk J7C3xUv53Dhi8uRbCGLwACXxILxvWRYhnjEyUVdz6RoYbbMyD5+uFplh3gXR0ChcvlrAtdnu9uSSx woUOM6SMBtZVTDUDDkV6wcSe/KkJsappJ+a/sfwEbP4Riv+MCf9DwoJo8PeS7d80EMgYljoFMKb4N F+HvQTy5kvSZT3wpLdSCQD9HE2EXqvGuqm52milVQgclyhRFUEgmXxuLC9LTqW80umnkfcfx6AYc0 L21Yp8+8jIN+FMSHrxLMCCm/WJC2PGf4/1jzyGtMIFmazkw00DyaSxsUElMdhD3b8Y+OwRKQOxLEH yYHvytOQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfKPm-0000000523W-3OL9; Thu, 02 Jul 2026 16:37:26 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfKPk-0000000523M-3oUR; Thu, 02 Jul 2026 16:37:24 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8F9F540AC0; Thu, 2 Jul 2026 16:37:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 51DE21F00A3A; Thu, 2 Jul 2026 16:37:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783010244; bh=JYz2t9rOB6Xr/OOk1r6hBAPIGizcFH6efsw9sdj+Wuk=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=WZST56m12/dPfMnjxUmbQmp1RfAlmgKoAVEw4PIMZ4PlBncoDVOpPHLhXYP7UxCWh w2WX+KHS3/yrMGg5LCd2XYhuAdJMjDQxwlHGKGw9jqZsaKzD+/KFXkvXy7F7G5Qsg3 knE0Vqs2EZSNPAXhvJCivRI9fSLzOrLQ269grsez37WOv08gbDiYAht7bRYkYFPRE6 ISdshM4ZM+9IRGOao127qU4ICBLcYBvu8TPw2ecv6dw6wdipSuAmq03smCaRYbYvJO pDlvHdbEJApBzIrzmr/WVzeLXYTFZPdGSv7hCjscCBFhpbkozKXxQQAaUzW7F3vlOu CltxHKPd6Du9A== Date: Thu, 2 Jul 2026 11:37:23 -0500 From: Rob Herring To: Manikandan.M@microchip.com Cc: krzk@kernel.org, pratyush@kernel.org, mwalle@kernel.org, takahiro.kuwano@infineon.com, miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, krzk+dt@kernel.org, conor+dt@kernel.org, srini@kernel.org, Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com, claudiu.beznea@tuxon.dev, linux@armlinux.org.uk, richardcochran@gmail.com, linusw@kernel.org, arnd@arndb.de, michael@walle.cc, linux-mtd@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org Subject: Re: [PATCH v4 1/7] dt-bindings: mtd: jedec,spi-nor: allow the SFDP to be exposed via NVMEM Message-ID: <20260702163723.GA227454-robh@kernel.org> References: <20260630092406.150587-1-manikandan.m@microchip.com> <20260630092406.150587-2-manikandan.m@microchip.com> <20260702-utopian-termite-of-perfection-f1f3ec@quoll> <860213fd-6a4b-42d4-a8f7-7308e070f09e@microchip.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <860213fd-6a4b-42d4-a8f7-7308e070f09e@microchip.com> 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 On Thu, Jul 02, 2026 at 06:55:15AM +0000, Manikandan.M@microchip.com wrote: > Hi Krzysztof, > > On 7/2/26 11:46 AM, Krzysztof Kozlowski wrote: > > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > > > On Tue, Jun 30, 2026 at 02:54:00PM +0530, Manikandan Muralidharan wrote: > >> Add an optional "sfdp" child node (compatible "jedec,sfdp") that > >> describes the SFDP as a read-only NVMEM provider via nvmem.yaml, so its > > > > What is SFDP? > > > SFDP is the Serial Flash Discoverable Parameters -- a JEDEC-standardised > (JESD216) read-only parameter table present in most SPI NOR flashes, the > table contents provide basic information about the flash. There are > standard tables which are specified by the JEDEC standard and there are > vendor tables. Is SFDP present or not discoverable? Or we have a table of discoverable parameters that itself is not discoverable. If it is discoverable, why does this need to be in DT? Rob