1NVIDIA Tegra GPIO controller 2 3Required properties: 4- compatible : "nvidia,tegra<chip>-gpio" 5- reg : Physical base address and length of the controller's registers. 6- interrupts : The interrupt outputs from the controller. For Tegra20, 7 there should be 7 interrupts specified, and for Tegra30, there should 8 be 8 interrupts specified. 9- #gpio-cells : Should be two. The first cell is the pin number and the 10 second cell is used to specify optional parameters: 11 - bit 0 specifies polarity (0 for normal, 1 for inverted) 12- gpio-controller : Marks the device node as a GPIO controller. 13- #interrupt-cells : Should be 2. 14 The first cell is the GPIO number. 15 The second cell is used to specify flags: 16 bits[3:0] trigger type and level flags: 17 1 = low-to-high edge triggered. 18 2 = high-to-low edge triggered. 19 4 = active high level-sensitive. 20 8 = active low level-sensitive. 21 Valid combinations are 1, 2, 3, 4, 8. 22- interrupt-controller : Marks the device node as an interrupt controller. 23 24Example: 25 26gpio: gpio@6000d000 { 27 compatible = "nvidia,tegra20-gpio"; 28 reg = < 0x6000d000 0x1000 >; 29 interrupts = < 0 32 0x04 30 0 33 0x04 31 0 34 0x04 32 0 35 0x04 33 0 55 0x04 34 0 87 0x04 35 0 89 0x04 >; 36 #gpio-cells = <2>; 37 gpio-controller; 38 #interrupt-cells = <2>; 39 interrupt-controller; 40}; 41