On 26-1-2014 14:32, Charles Steinkuehler wrote:
On 1/26/2014 5:37 AM, Charles Steinkuehler wrote:
I'm working on building a "universal" device tree overlay that can be
used to enable and switch between most of the various interesting pin
functions (uart, timers, spi, gpio, pru in/out, etc). One problem is
the BeagleBone specific gpio_of_helper driver designed to make it easy
to export GPIO pins via the device tree is forcing a fixed direction of
input or output on the GPIO pins.
Before I start hacking on the driver, I'm wondering why the pins weren't
either exported with the GPIOF_EXPORT_CHANGEABLE flag set, or why some
provision wasn't made to allow specifying the direction could be changed.
I verified the attached minor patch does what I need and allows the user
to change the GPIO direction after the pin is exported by the
gpio-of-helper driver.
Without this patch, any pins exported to sysfs by the gpio-of-helper
driver are missing the /sys/class/gpio/gpio<N>/direction file and are
stuck in either input or output mode.
Comments?
Great! It looks so obvious, this makes me wonder why it wasn't
implemented the first time...!
-- Bas
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