NVIDIA Tegra GPIO controller Required properties: - compatible : "nvidia,tegra-gpio" - reg : Physical base address and length of the controller's registers. - interrupts : The interrupt outputs from the controller. For Tegra20, there should be 7 interrupts specified, and for Tegra30, there should be 8 interrupts specified. - #gpio-cells : Should be two. The first cell is the pin number and the second cell is used to specify optional parameters: - bit 0 specifies polarity (0 for normal, 1 for inverted) - gpio-controller : Marks the device node as a GPIO controller. - #interrupt-cells : Should be 2. The first cell is the GPIO number. The second cell is used to specify flags: bits[3:0] trigger type and level flags: 1 = low-to-high edge triggered. 2 = high-to-low edge triggered. 4 = active high level-sensitive. 8 = active low level-sensitive. Valid combinations are 1, 2, 3, 4, 8. - interrupt-controller : Marks the device node as an interrupt controller. Example: gpio: gpio@6000d000 { compatible = "nvidia,tegra20-gpio"; reg = < 0x6000d000 0x1000 >; interrupts = < 0 32 0x04 0 33 0x04 0 34 0x04 0 35 0x04 0 55 0x04 0 87 0x04 0 89 0x04 >; #gpio-cells = <2>; gpio-controller; #interrupt-cells = <2>; interrupt-controller; };