Just to update you that I have found my problem ! In my config file, I did not notice that my own board and an other imx27 board was enabled ! So the gpios configured was the one from this board and not mine's (thanks debugfs !). That is why it did not act like I wanted. Otherwise, the gpios are still exported as "gpioXX" and not with "name_of_gpio". The label "name_of_gpio" can be found in the debugfs but not printed in the sysfs. I don't know if there is a way to change that, I will search for it if I have time. Best regards, -- Mylène JOSSERAND Le 27/02/2013 11:51, Mylene Josserand a écrit : > Hi everyone ! > > > I am currently updating the kernel of my company and I have some > problems about gpios so I am asking you some help ! :) > I think I am in the good mailist because it is the first time I update a > kernel and a board configuration ! :D > > The previous kernel used was 2.6.31.14 and I am trying to update it to > last stable version 3.7.9. > > In the previous kernel for a "home-made" board (with a IMx27 and a > ARM9), we used these methods to export gpios in sysfs (for example for > Gpio OUT) : > > mxc_gpio_mode(gpio_number | GPIO_GPIO | GPIO_OUT); > gpio_request(gpio_number, name_of_gpio); > gpio_export(gpio_number, 0); > gpio_direction_output(gpio_number, gpio_value); > > In the sysfs, the gpio exported was visible under "name_of_gpio". > > Now, if I use the same methods, I can not get anything in sysfs except > "gpiochip0, gpiochip32" etc. > I tried to use these functions in a module and I could export a gpio but > under "gpioXX" and not "name_of_gpio". Moreover, I tried to export a > gpio using the sysfs interface. I succeeded to export it and set > direction to "out" but when I try to set the value, it did not work and > the value is always set to 0 (and this gpio was configured as OUT in the > board). > > I make a diff about the gpio documentation and the old kernel used did > not seem to have many differences with the new kernel ! There is only > some methods added such as "gpio_resquest_one" and "gpio_export_link". I > tried them without good results. > > > What am I doing wrong ? > What am I missing to make it work ? > Is there some other configurations to add in the board configuration ? > > > Thank you for any help/explanation ! > > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
