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 7758AC44500 for ; Mon, 6 Jul 2026 13:57:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:References:To:From:Cc:Subject:Message-Id:Date:Mime-Version: 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=VzKCezKKMCIr7dMUdeaEVyuq9eo0ASWai1GBw+Rtw8s=; b=1kad0i77wZc9WlGmvmzKzKuu3y le4n6FXdCZB2+MaihnPvXY5/S6l9NxzyDfBZggl/PEhSMea+k6RD4RJvMlunHyY+ynO1NKDH/RGbj O1XDLHx+rMja1YSHT2ApskaW7qRtL3FCAs2m9SAFOiAs38s6nJIgXujKMdrk0ejCbEAYzNKtIQDe6 SXgzABfh9baQMa9W98D38Qesf9GJfw3JpkY61VRV4Zvr7MiLWi5lgnXwQlQAHk+nztQeSkmBBhcXC prABwPyjdieFpWbAeIwJ9Ye4QemtEJd2VW4M6cBhIJrhQCalv8/0AnXeP8o9FuQhPvhbahqu2aVfq Q9neFkYg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wgjoy-0000000CfqC-4C0K; Mon, 06 Jul 2026 13:57:17 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wgjox-0000000Cfpw-3gh5 for linux-mtd@lists.infradead.org; Mon, 06 Jul 2026 13:57:15 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with UTF8SMTP id 3C08A600AE; Mon, 6 Jul 2026 13:57:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with UTF8SMTPSA id 06FDF1F000E9; Mon, 6 Jul 2026 13:57:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783346234; bh=IJ84ZFLfnxbMa5FiyT2FzT5TRgxXzvFAljXuuYYn2eA=; h=Date:Subject:Cc:From:To:References:In-Reply-To; b=VvonFYDC4V9ijYgZpxijEBHEwT4BFX2UWaY/JtUZ+RollDmJj/q3yCvK7841vCsgM zPmXAnLWCr2csS2mePAG6YruaTnNqmvp33bnWqo2NMIXzTjN1d4yGm0J2n7JHmTzP8 THkbdnVodCI6a0AxbMzauS7SVbgk07oGzEcldBV69B5EvSYKC98pxGno6KwyWapO5K cHgG3rj5BB2bBzYyLlBvu7zE9gKcCtOWbCv6xgr/dnNcaci24A8zzaZHRchv/+vXPx F1q+4AA6V8ik+Y11MeZcPsOkGaOHXa/8Z8HF7kpaRx9EmIjdCa8ScItqyA4kOqU/WS RqcV3rRlbZzoA== Mime-Version: 1.0 Date: Mon, 06 Jul 2026 15:57:10 +0200 Message-Id: Subject: Re: [PATCH 02/30] mtd: spi-nor: winbond: Normalize names Cc: "Thomas Petazzoni" , "Steam Lin" , , From: "Michael Walle" To: "Miquel Raynal" , "Pratyush Yadav" , "Takahiro Kuwano" , "Richard Weinberger" , "Vignesh Raghavendra" X-Mailer: aerc 0.20.0 References: <20260529-winbond-v7-1-spi-nor-jv-cleanup-v1-0-87e5d3122244@bootlin.com> <20260529-winbond-v7-1-spi-nor-jv-cleanup-v1-2-87e5d3122244@bootlin.com> In-Reply-To: <20260529-winbond-v7-1-spi-nor-jv-cleanup-v1-2-87e5d3122244@bootlin.com> X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============3937800320212622319==" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org --===============3937800320212622319== Content-Type: multipart/signed; boundary=145109b60d41ab18fdbd06d0258c84cbfc263ab09b2fa0ed310d2c243b85; micalg=pgp-sha384; protocol="application/pgp-signature" --145109b60d41ab18fdbd06d0258c84cbfc263ab09b2fa0ed310d2c243b85 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 On Fri May 29, 2026 at 5:22 PM CEST, Miquel Raynal wrote: > Winbond chips cannot just be named eg. "W25Q02JV". There are always more > letters after that name, some of them matter. > > - W is the Winbond prefix > - 25Q is the type of device > -> 25Q indicates a quad capable SPI NOR > -> 25H indicates an automotive grade chip > - 02J is the density > -> in this case 2Gib > - V is the voltage > -> V means 3.3V > -> W means 1.8V > - The next letters (either 2 or 3 letters) are completely irrelevant for > the software and purely indicate the hardware package. > - The penultimate letter is the temperature grade > -> I for Industrial grade > -> J means "above" industrial > - Q, N or M indicate factory states (like QE=3D1) and also the DTR > capability. > -> Q and N typically have the same IDs > -> M chips typically have a different ID > > As a result, W25Q01NWxxIQ is irrelevant and would better be named > W25Q01NW-Q, W25Q02JV is irrelevant and would better be named W25Q02JV-M, > etc. OTOH if you try to search for that name on the internet/datasheets you don't find anything, while the xx somehow indicates that something is missing here. I haven't made my mind up on the naming. But I also don't care too much. Reviewed-by: Michael Walle -michael --145109b60d41ab18fdbd06d0258c84cbfc263ab09b2fa0ed310d2c243b85 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iKgEABMJADAWIQTIVZIcOo5wfU/AngkSJzzuPgIf+AUCaku0NxIcbXdhbGxlQGtl cm5lbC5vcmcACgkQEic87j4CH/heRQGAqZrtHCrl2OG1qB0kaxao9xYvgNLrG73Z RQx45fYo4bHF9kYje7d94IvODPZRdppkAX0cOuOJCdRHzLTewX9469RTEPNSymhQ y8N+39YiIpQe88u79AaQrcUPwiJ7V3ngNhw= =1dym -----END PGP SIGNATURE----- --145109b60d41ab18fdbd06d0258c84cbfc263ab09b2fa0ed310d2c243b85-- --===============3937800320212622319== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ --===============3937800320212622319==--