From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from madmax.studelec-sa.com (unknown [195.167.234.227]) by ozlabs.org (Postfix) with ESMTP id 79DD92C0209 for ; Thu, 21 Mar 2013 20:04:37 +1100 (EST) Received: from localhost (madmax.studelec-sa.com [127.0.0.1]) by madmax.studelec-sa.com (Postfix) with ESMTP id 796F93FE090 for ; Thu, 21 Mar 2013 09:54:48 +0100 (CET) Received: from madmax.studelec-sa.com ([127.0.0.1]) by localhost (madmax.studelec-sa.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6jzvLSh0HLE5 for ; Thu, 21 Mar 2013 09:54:48 +0100 (CET) Received: from [192.168.1.12] (AMontpellier-552-1-219-46.w86-202.abo.wanadoo.fr [86.202.74.46]) by madmax.studelec-sa.com (Postfix) with ESMTPSA id ED8283FE08F for ; Thu, 21 Mar 2013 09:54:47 +0100 (CET) Message-ID: <514ACAD6.6010909@studelec-sa.com> Date: Thu, 21 Mar 2013 09:54:46 +0100 From: CF Studelec MIME-Version: 1.0 To: linuxppc-dev@lists.ozlabs.org Subject: MPC5121e, Linux, simple IO ports Content-Type: text/plain; charset=ISO-8859-1 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hello, This is a simple board base on mpc5121e MCU. Gpio is detected: kernel is compiled with its support - i got gpiochip_find_base: found new base @224 in dmesg - on kernel 3.0.4. But i'm unable to access it through /sys/class/gpio. I can successfully export a pin (ie, if i type cat 224 > export, gpio224 is created), but i can't successfully control it: echo "out" > /sys/class/gpio/gpio224/direction cat /sys/class/gpio/gpio224/value 0 echo 1 > /sys/class/gpio/gpio224/value cat /sys/class/gpio/gpio224/value 0 My need is a simple chipselect (well, 3 chipselect exactly ), for a custom design. Running linux is mandatory. I suspect the MPC5121e to be in the bad function mode, so: - does anyone knows how to change mode ? What register can i acces and how ? does it worths a try ? - does anyone successfully performed simple IO control ? Last thing, i have tryed to access internal registers through /dev/mem, but no success. There are very few ressources available for this microcontroler, but i'm stick to it. Perhaps anybody knows how to access (read) internal registers with /proc or sys-fs ? Thank you for your help.