>> Similarly, I'd like to be able to signal the export of a GPIO to userspace >> (/sys/class/gpio/gpioWXY) without a customized board file. Since we're >> using DT to specify the hardware in a system, it would be a convenient place >> to specify exporting GPIOs to userspace. > > I believe that the GPIO subsystem maintainers (Linus Walleij and > Alexandre Courbot) were trying to make GPIO control from userspace more > consistent (independent of DT) for a while. However I am not all that > familiar with the GPIO subsystem and may have misunderstood some of the > work that's going on there. If I properly understood what Chris wants, he may want to have a look at the following works: - GPIO hogging mechanism to configure a GPIO using the device tree - not sure if you can also export at that time? - Markus' ongoing work on GPIO naming: http://www.spinics.net/lists/linux-gpio/msg07844.html - Device tree overlays, to separate the configuration of GPIOs for user-space use (which is arguably specific to one's use case) from the rest of the board's definition With these 3 works I think Chris' needs would be fulfilled, at least as far as GPIOs are concerned. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
