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+NVIDIA Tegra GPIO controller
+
+Required properties:
+- compatible : "nvidia,tegra<chip>-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;
+};