From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754887AbbGPI6Y (ORCPT ); Thu, 16 Jul 2015 04:58:24 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:53597 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754566AbbGPI6U (ORCPT ); Thu, 16 Jul 2015 04:58:20 -0400 Date: Thu, 16 Jul 2015 09:57:39 +0100 From: Mark Brown To: Ranjit Abhimanyu Waghmode Cc: Michal Simek , Soren Brinkmann , "dwmw2@infradead.org" , "computersforpeace@gmail.com" , "zajec5@gmail.com" , "marex@denx.de" , "shijie.huang@intel.com" , "juhosg@openwrt.org" , "ben@decadent.org.uk" , "linux-mtd@lists.infradead.org" , "linux-spi@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Harini Katakam , Punnaiah Choudary Kalluri , "ran27jit@gmail.com" Message-ID: <20150716085739.GT11162@sirena.org.uk> References: <1436445895-25504-1-git-send-email-ranjit.waghmode@xilinx.com> <20150714164005.GE11162@sirena.org.uk> <7CFCFE83B8145347A1D424EC939F1C3CA7E53D@XAP-PVEXMBX01.xlnx.xilinx.com> <20150715160146.GS11162@sirena.org.uk> <7CFCFE83B8145347A1D424EC939F1C3CA7E758@XAP-PVEXMBX01.xlnx.xilinx.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="nvwB+Y2gyxL5aXTF" Content-Disposition: inline In-Reply-To: <7CFCFE83B8145347A1D424EC939F1C3CA7E758@XAP-PVEXMBX01.xlnx.xilinx.com> X-Cookie: Stay together, drag each other down. User-Agent: Mutt/1.5.23 (2014-03-12) X-SA-Exim-Connect-IP: 94.175.94.161 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Re: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support in Zynq MPSoC GQSPI controller X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nvwB+Y2gyxL5aXTF Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jul 16, 2015 at 07:27:34AM +0000, Ranjit Abhimanyu Waghmode wrote: > For an example take two flashes connected in stacked mode. > For user it doesn't matter whether how many flashes are really connected.= =20 > There will be situation like, single partition is spread across two flash= es (partition staring at the end of one flash and continued to the second f= lash). But it has to be shown contiguous to user. > In this scenario, I am not clear how MTD layer will handle the case. > It would be great if you could just put some light on it. That's something for the MTD layer or possibly even a layer above it to worry about - this situation is the same as we have with disks where we have md which combines other devices, if something similar is needed for flash we should use a similar pattern. --nvwB+Y2gyxL5aXTF Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJVp3ICAAoJECTWi3JdVIfQFH4H/jgoYSPT5C2B/zTNqOObAyHF fTf6kdLH3FXQaw5nenrlDtmAKe4I7jEx3Dc+pqKCQTyu6PazwiIVzFgg36NmaK21 IS2H8bScruoIq+Ur2776UaTgfA/AWBfxLasUZSF9TO1zKKh7c+WcyIG+2BTn1Jnb 4RrT7HNX8QYZ6mSIo1VfsxBM0MkwHfB6QtTZMSQm6Z968J1bqM4gI2scyq0OXsWT kveJeJiDYV82leFGfqhFUIDB4ySrFoAkYja8VDQ0cd3H68LJkFc9lziV92HRvqFm 6iu8l1ZM+BkjPK90G6SOuk8hEH97O1XAvYawOEDhZTqh7wolAXiOfJjjLKkO99E= =phUr -----END PGP SIGNATURE----- --nvwB+Y2gyxL5aXTF-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: broonie@kernel.org (Mark Brown) Date: Thu, 16 Jul 2015 09:57:39 +0100 Subject: [RFC PATCH 0/2] spi: add dual parallel & stacked mode support in Zynq MPSoC GQSPI controller In-Reply-To: <7CFCFE83B8145347A1D424EC939F1C3CA7E758@XAP-PVEXMBX01.xlnx.xilinx.com> References: <1436445895-25504-1-git-send-email-ranjit.waghmode@xilinx.com> <20150714164005.GE11162@sirena.org.uk> <7CFCFE83B8145347A1D424EC939F1C3CA7E53D@XAP-PVEXMBX01.xlnx.xilinx.com> <20150715160146.GS11162@sirena.org.uk> <7CFCFE83B8145347A1D424EC939F1C3CA7E758@XAP-PVEXMBX01.xlnx.xilinx.com> Message-ID: <20150716085739.GT11162@sirena.org.uk> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Jul 16, 2015 at 07:27:34AM +0000, Ranjit Abhimanyu Waghmode wrote: > For an example take two flashes connected in stacked mode. > For user it doesn't matter whether how many flashes are really connected. > There will be situation like, single partition is spread across two flashes (partition staring at the end of one flash and continued to the second flash). But it has to be shown contiguous to user. > In this scenario, I am not clear how MTD layer will handle the case. > It would be great if you could just put some light on it. That's something for the MTD layer or possibly even a layer above it to worry about - this situation is the same as we have with disks where we have md which combines other devices, if something similar is needed for flash we should use a similar pattern. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 473 bytes Desc: Digital signature URL: