The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/gpio/nvidia,tegra20-gpio.txt

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    1 NVIDIA Tegra GPIO controller
    2 
    3 Required 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 
   24 Example:
   25 
   26 gpio: 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 };

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