From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 52466265CA2 for ; Mon, 6 Jul 2026 13:57:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783346236; cv=none; b=jOsVm+FzyL57s6t6YbCtpyqYH9sjn/NUsughWqV9aEb41FbvlFBqFy4C8zrS33Ana6DSv4XS3ytHzDU3cON11YwKNlGwGvuAawOV8MyObfLllPau/0IWQft+EQGWStKXnAJ1t2NsQUaOEw9LIRyWZrbWnjMEHSfMSGGyuW9ehG0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783346236; c=relaxed/simple; bh=Fn/4B21T82tL499zQ8cmQJkVagrgUwdPwYnaV7Y7lrE=; h=Mime-Version:Content-Type:Date:Message-Id:Subject:Cc:From:To: References:In-Reply-To; b=m/PelinCksAWGZtCgiTgbW5ktpMcT98A2TSt6zibS0Egd8xI8aUVG9gF085FD7u8Li503Hun4z1XbyqOVn/gbJQEeADw1oQd7eN3S/nYJDgfy12VTkbnyQt8Hoa0Uh4omC0uBDBIppHWKvkDKHAYe3SNEEU6dARyp51/b+n6FGo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VvonFYDC; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VvonFYDC" 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== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: multipart/signed; boundary=145109b60d41ab18fdbd06d0258c84cbfc263ab09b2fa0ed310d2c243b85; micalg=pgp-sha384; protocol="application/pgp-signature" 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> --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--