Based on kernel version 3.9. Page generated on 2013-05-02 22:58 EST.
1 ARM PL061 GPIO controller 2 3 Required properties: 4 - compatible : "arm,pl061", "arm,primecell" 5 - #gpio-cells : Should be two. The first cell is the pin number and the 6 second cell is used to specify optional parameters: 7 - bit 0 specifies polarity (0 for normal, 1 for inverted) 8 - gpio-controller : Marks the device node as a GPIO controller. 9 - interrupts : Interrupt mapping for GPIO IRQ.