From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934450AbcIFKLa (ORCPT ); Tue, 6 Sep 2016 06:11:30 -0400 Received: from bear.ext.ti.com ([198.47.19.11]:60215 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932286AbcIFKLX (ORCPT ); Tue, 6 Sep 2016 06:11:23 -0400 Subject: Re: [PATCH 2/2] ARM: dts: am57xx-beagle-x15: Add support for rev B1 To: Robert Nelson References: <20160902090600.27262-1-nm@ti.com> <20160902090600.27262-3-nm@ti.com> CC: Nishanth Menon , Tony Lindgren , Tomi Valkeinen , Kishon Vijay Abraham I , "linux-omap@vger.kernel.org" , linux kernel , "linux-arm-kernel@lists.infradead.org" , devicetree , Jason Kridner From: Sekhar Nori Message-ID: <84be68f4-c5a6-0afe-c402-1adba9172918@ti.com> Date: Tue, 6 Sep 2016 15:40:51 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday 02 September 2016 07:22 PM, Robert Nelson wrote: > On Fri, Sep 2, 2016 at 5:41 AM, Sekhar Nori wrote: >> + Robert Nelson >> >> On Friday 02 September 2016 02:36 PM, Nishanth Menon wrote: >> >> I understand that there are existing users of A2 boards and so we simply >> cannot remove support for those boards (at least yet). >> >> But given the small numbers of A2 boards, its also quite likely that we >> will not have enough test coverage for those boards. Especially as years >> pass and there are fewer and fewer people with access to working A2 boards. > > I have a A1, A2 and a B1, that i use for testing for > beagleboard.org... The A1 use to be ssh-accessible for developers, > but since moving to my new house, I haven't "yet" got that one setup > for developers. Right now i'm using the A2 & B1 for development of > our default images. > > Jason Kridner also has a number of boards Availability of hardware _somewhere_ is one aspect. I am still worried about the big difference in scale. A2 are ~200 in number where as the production version should be in thousands. Reuse is meant to reduce maintenance cost. In this case though, it seems like it will do exactly the opposite - making anyone with a production version rely on few with a non-production version to make any updates at all. IMHO, a common .dtsi made sense if both the boards went to production and are largely available. device-tree sources continue to get updates even though hardware itself is pretty much frozen. am335x-bone-common.dtsi created 3 years back is receiving updates still - as recently as 3 months back. So, I do expect that A2 will need to get tested in many years to come. Not sure if it really worth that much effort. Thanks, Sekhar From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sekhar Nori Subject: Re: [PATCH 2/2] ARM: dts: am57xx-beagle-x15: Add support for rev B1 Date: Tue, 6 Sep 2016 15:40:51 +0530 Message-ID: <84be68f4-c5a6-0afe-c402-1adba9172918@ti.com> References: <20160902090600.27262-1-nm@ti.com> <20160902090600.27262-3-nm@ti.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Robert Nelson Cc: Nishanth Menon , Tony Lindgren , Tomi Valkeinen , Kishon Vijay Abraham I , "linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , linux kernel , "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , devicetree , Jason Kridner List-Id: devicetree@vger.kernel.org On Friday 02 September 2016 07:22 PM, Robert Nelson wrote: > On Fri, Sep 2, 2016 at 5:41 AM, Sekhar Nori wrote: >> + Robert Nelson >> >> On Friday 02 September 2016 02:36 PM, Nishanth Menon wrote: >> >> I understand that there are existing users of A2 boards and so we simply >> cannot remove support for those boards (at least yet). >> >> But given the small numbers of A2 boards, its also quite likely that we >> will not have enough test coverage for those boards. Especially as years >> pass and there are fewer and fewer people with access to working A2 boards. > > I have a A1, A2 and a B1, that i use for testing for > beagleboard.org... The A1 use to be ssh-accessible for developers, > but since moving to my new house, I haven't "yet" got that one setup > for developers. Right now i'm using the A2 & B1 for development of > our default images. > > Jason Kridner also has a number of boards Availability of hardware _somewhere_ is one aspect. I am still worried about the big difference in scale. A2 are ~200 in number where as the production version should be in thousands. Reuse is meant to reduce maintenance cost. In this case though, it seems like it will do exactly the opposite - making anyone with a production version rely on few with a non-production version to make any updates at all. IMHO, a common .dtsi made sense if both the boards went to production and are largely available. device-tree sources continue to get updates even though hardware itself is pretty much frozen. am335x-bone-common.dtsi created 3 years back is receiving updates still - as recently as 3 months back. So, I do expect that A2 will need to get tested in many years to come. Not sure if it really worth that much effort. Thanks, Sekhar -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 From: nsekhar@ti.com (Sekhar Nori) Date: Tue, 6 Sep 2016 15:40:51 +0530 Subject: [PATCH 2/2] ARM: dts: am57xx-beagle-x15: Add support for rev B1 In-Reply-To: References: <20160902090600.27262-1-nm@ti.com> <20160902090600.27262-3-nm@ti.com> Message-ID: <84be68f4-c5a6-0afe-c402-1adba9172918@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Friday 02 September 2016 07:22 PM, Robert Nelson wrote: > On Fri, Sep 2, 2016 at 5:41 AM, Sekhar Nori wrote: >> + Robert Nelson >> >> On Friday 02 September 2016 02:36 PM, Nishanth Menon wrote: >> >> I understand that there are existing users of A2 boards and so we simply >> cannot remove support for those boards (at least yet). >> >> But given the small numbers of A2 boards, its also quite likely that we >> will not have enough test coverage for those boards. Especially as years >> pass and there are fewer and fewer people with access to working A2 boards. > > I have a A1, A2 and a B1, that i use for testing for > beagleboard.org... The A1 use to be ssh-accessible for developers, > but since moving to my new house, I haven't "yet" got that one setup > for developers. Right now i'm using the A2 & B1 for development of > our default images. > > Jason Kridner also has a number of boards Availability of hardware _somewhere_ is one aspect. I am still worried about the big difference in scale. A2 are ~200 in number where as the production version should be in thousands. Reuse is meant to reduce maintenance cost. In this case though, it seems like it will do exactly the opposite - making anyone with a production version rely on few with a non-production version to make any updates at all. IMHO, a common .dtsi made sense if both the boards went to production and are largely available. device-tree sources continue to get updates even though hardware itself is pretty much frozen. am335x-bone-common.dtsi created 3 years back is receiving updates still - as recently as 3 months back. So, I do expect that A2 will need to get tested in many years to come. Not sure if it really worth that much effort. Thanks, Sekhar