On Mon, May 04, 2015 at 10:49:25AM +0200, Johan Hovold wrote: > Firmware should describe pin directionality and function, and undefined > pins should never be allowed to be accessed from userspace. No, that's totally wrong if you consider one of the most common use cases out there... Think about something like a Raspberry Pi, where you have a header with GPIOs on it, which can be used for multiple different purposes (and are even multiplexed with some on-SoC functions.) "Firmware" can't know about all possible configurations of those IO pins. That's why Raspberry Pi uses a userspace helper and programs stuff up appropriately for the users application. -- FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up according to speedtest.net. -- 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
