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bone-pinmux-helper does not enable GPIO modules #45
GPIO modules are not enabled when a device tree overlay using bone-pinmux-helper is loaded. The module will be enabled after a single pin from it is exported through sysfs. It's a good workaround, but not an elegant solution to the problem. Before exporting only GPIO1 is enabled and every attempt to access GPIOs 0, 2, or 3 causes a bus error in the application. This is a topic on the beagleboard group discussing the issue: https://groups.google.com/forum/?fromgroups#!category-topic/beagleboard/OYFp4EXawiI