From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko Schocher Subject: Re: GPIO triggers kernel reboot Date: Mon, 27 Jan 2014 07:17:18 +0100 Message-ID: <52E5F9EE.2020707@denx.de> References: <52E3E031.6040709@denx.de> <371E240E6FC1D44DA5E51EE9DCDCB7845E5EA0A1@NA-MBX-01.mgc.mentorg.com> <371E240E6FC1D44DA5E51EE9DCDCB7845E5EA0E1@NA-MBX-01.mgc.mentorg.com> Reply-To: hs@denx.de Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <371E240E6FC1D44DA5E51EE9DCDCB7845E5EA0E1@NA-MBX-01.mgc.mentorg.com> Sender: linux-embedded-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: "Mehaffey, John" Cc: "linux-embedded@vger.kernel.org" , Wolfgang Denk , "linux-arm-kernel@lists.infradead.org" Hello John, Am 25.01.2014 21:24, schrieb Mehaffey, John: >> -----Original Message----- >> From: linux-embedded-owner@vger.kernel.org >> [mailto:linux-embedded-owner@vger.kernel.org] On Behalf Of Heiko >> Schocher >> Sent: Saturday, January 25, 2014 8:03 AM >> To: linux-embedded@vger.kernel.org >> Cc: Wolfgang Denk; linux-arm-kernel@lists.infradead.org >> Subject: GPIO triggers kernel reboot >> >> Hello all, >> >> is it possible to reboot current mainline kernel triggered from a GPIO in kernel space? >> >> If not, how can be done this, so that it has a chance to go into mainline? >> >> Thanks for any suggestions >> >> bye, >> Heiko > > Hi Heiko, > Call kexec() from the GPIO driver. > It will take some effort to get it right :) Thanks for your answer! Hmm.. but has this a chance to go into mainline? > Or if a simple reboot is all that you want, examine the several reboot APIs in kernel/reboot.c A current implementation from a customer is for an arm, am335x based board to add in board setup code: ret = request_irq(OMAP_GPIO_IRQ(RESET_BUTTON_IRQ_GPIO) , (irq_handler_t)arm_pm_restart, IRQF_TRIGGER_LOW, "reset button", NULL); and as I want to bring this board to mainline, I think this is not an acceptable/good way ... or? bye, Heiko -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany