From mboxrd@z Thu Jan 1 00:00:00 1970 From: voice.shen@atmel.com (Bo Shen) Date: Wed, 17 Oct 2012 10:19:34 +0800 Subject: [PATCH v3 2/2] i2c: change id to let i2c-at91 work In-Reply-To: <20121016111027.GE12801@game.jcrosoft.org> References: <1350293428-24551-1-git-send-email-voice.shen@atmel.com> <1350293428-24551-3-git-send-email-voice.shen@atmel.com> <20121015150244.GZ12801@game.jcrosoft.org> <507CD0CA.9010006@atmel.com> <20121016083954.GB12801@game.jcrosoft.org> <507D361C.6020403@atmel.com> <20121016111027.GE12801@game.jcrosoft.org> Message-ID: <507E15B6.7040004@atmel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi J, On 10/16/2012 19:10, Jean-Christophe PLAGNIOL-VILLARD wrote: > On 18:25 Tue 16 Oct , Bo Shen wrote: >> Hi J, >> >> On 10/16/2012 16:39, Jean-Christophe PLAGNIOL-VILLARD wrote: >>> On 11:13 Tue 16 Oct , Bo Shen wrote: >>>> Hi J, >>>> >>>> On 10/15/2012 23:02, Jean-Christophe PLAGNIOL-VILLARD wrote: >>>>> On 17:30 Mon 15 Oct , Bo Shen wrote: >>>>>> The i2c core driver will turn the platform device ID to busnum >>>>>> When using platfrom device ID as -1, it means dynamically assigned >>>>>> the busnum. When writing code, we need to make sure the busnum, >>>>>> and call i2c_register_board_info(int busnum, ...) to register device >>>>>> if using -1, we do not know the value of busnum >>>>>> >>>>>> In order to solve this issue, set the platform device ID as a fix number >>>>>> Here using 0 to match the busnum used in i2c_regsiter_board_info() >>>>>> >>>>>> Signed-off-by: Bo Shen >>>>>> --- >>>>> >>>>> can you check when this append for the first time to schedule a patch for stable too >>>> >>>> OK. I will resend it and add linux stable into the cc list. >>> no this not how it work >>> >>> I ask you to check which patch add the regression and then when this is >>> applied in the kernel we will request greg to apply it too to the stable >> >> The code is using id = -1 appear 4 years ago. And after dig, I don't >> find which patch cause this the regression. > so use git bisect to find the commit responsible Thanks for your information. Finally, I found the following commit add this: 3267c077e589bc146a0b45e220fcefafbf83fb80 [ARM] 3396/2: AT91RM9200 Platform devices update BRs, Bo Shen > Best Regards, > J. >