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[23.128.96.18]) by mx.google.com with ESMTP id u19si968765ejf.61.2020.06.01.23.36.13; Mon, 01 Jun 2020 23:36:37 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726184AbgFBGeH (ORCPT + 99 others); Tue, 2 Jun 2020 02:34:07 -0400 Received: from twhmllg3.macronix.com ([211.75.127.131]:37240 "EHLO TWHMLLG3.macronix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725872AbgFBGeG (ORCPT ); Tue, 2 Jun 2020 02:34:06 -0400 Received: from twhfmlp1.macronix.com (twhfmlp1.macronix.com [172.17.20.91]) by TWHMLLG3.macronix.com with ESMTP id 0526WqhW083980; Tue, 2 Jun 2020 14:32:52 +0800 (GMT-8) (envelope-from masonccyang@mxic.com.tw) Received: from MXML06C.mxic.com.tw (mxml06c.mxic.com.tw [172.17.14.55]) by Forcepoint Email with ESMTP id C42C77D7708EA654953F; Tue, 2 Jun 2020 14:32:52 +0800 (CST) In-Reply-To: <20200529092353.56nfczya6ygfbki2@yadavpratyush.com> References: <1590737775-4798-1-git-send-email-masonccyang@mxic.com.tw> <1590737775-4798-2-git-send-email-masonccyang@mxic.com.tw> <20200529092353.56nfczya6ygfbki2@yadavpratyush.com> To: "Pratyush Yadav" Cc: boris.brezillon@collabora.com, broonie@kernel.org, juliensu@mxic.com.tw, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, linux-spi@vger.kernel.org, matthias.bgg@gmail.com, miquel.raynal@bootlin.com, p.yadav@ti.com, richard@nod.at, tudor.ambarus@microchip.com, vigneshr@ti.com Subject: Re: [PATCH v4 1/7] mtd: spi-nor: sfdp: get octal mode maximum speed from BFPT MIME-Version: 1.0 X-KeepSent: 61F39C24:01B2337A-4825857B:00238327; type=4; name=$KeepSent X-Mailer: Lotus Notes Release 8.5.3FP4 SHF90 June 10, 2013 Message-ID: From: masonccyang@mxic.com.tw Date: Tue, 2 Jun 2020 14:32:53 +0800 X-MIMETrack: Serialize by Router on MXML06C/TAIWAN/MXIC(Release 9.0.1FP10 HF265|July 25, 2018) at 2020/06/02 PM 02:32:52, Serialize complete at 2020/06/02 PM 02:32:52 Content-Type: text/plain; charset="US-ASCII" X-MAIL: TWHMLLG3.macronix.com 0526WqhW083980 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Pratyush, > > Subject > > Re: [PATCH v4 1/7] mtd: spi-nor: sfdp: get octal mode maximum speed from BFPT > > On 29/05/20 03:36PM, Mason Yang wrote: > > Get maximum operation speed of device in octal mode from > > BFPT 20th DWORD. > > I don't like the idea of getting the maximum operation speed from BFPT > when the Profile 1.0 table already tells us that. For example, the > 200MHz operation dummy cycles field in the 4th DWORD says that a value > of 0 means the frequency is not supported. So the Profile 1.0 table > already tells us what frequencies the flash can run at in xSPI Profile > 1.0 mode. As JEDEC spec. mentioned that Operation faster than 200MHz is not part of the current xSPI Spec. However, this does not prevent vendors from making devices that operate at higher speed. In addition, current xSPP profile 1.0 table only defined up to 200MHz. > > So IMO we should use the Profile 1.0 table for this instead because > it will be a localized change which is easier to maintain. I also get > the feeling it will be less prone to mis-interpretations. > > > Signed-off-by: Mason Yang > > --- thanks for your time & comments. Mason CONFIDENTIALITY NOTE: This e-mail and any attachments may contain confidential information and/or personal data, which is protected by applicable laws. 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