Check if the GPIO is valid (or set at all). If no GPIO is set in the
devicetree, a gpiolib related kernel warning + stacktrace is shown during
boot and gpio-export reports GPIOs as exported albeit none really is.
Signed-off-by: Mathias Kresin <dev@kresin.me>
This target aims to replace ar71xx mid-term. The big part that is still
missing is making the MMIO/AHB wifi work using OF. NAND and mikrotik
subtargets will follow.
Signed-off-by: John Crispin <john@phrozen.org>