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/gpio_lpc32xx.txt

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    1 NXP LPC32xx SoC GPIO controller
    2 
    3 Required properties:
    4 - compatible: must be "nxp,lpc3220-gpio"
    5 - reg: Physical base address and length of the controller's registers.
    6 - gpio-controller: Marks the device node as a GPIO controller.
    7 - #gpio-cells: Should be 3:
    8    1) bank:
    9       0: GPIO P0
   10       1: GPIO P1
   11       2: GPIO P2
   12       3: GPIO P3
   13       4: GPI P3
   14       5: GPO P3
   15    2) pin number
   16    3) optional parameters:
   17       - bit 0 specifies polarity (0 for normal, 1 for inverted)
   18 - reg: Index of the GPIO group
   19 
   20 Example:
   21 
   22         gpio: gpio@40028000 {
   23                 compatible = "nxp,lpc3220-gpio";
   24                 reg = <0x40028000 0x1000>;
   25                 gpio-controller;
   26                 #gpio-cells = <3>; /* bank, pin, flags */
   27         };
   28 
   29         leds {
   30                 compatible = "gpio-leds";
   31 
   32                 led0 {
   33                         gpios = <&gpio 5 1 1>; /* GPO_P3 1, active low */
   34                         linux,default-trigger = "heartbeat";
   35                         default-state = "off";
   36                 };
   37 
   38                 led1 {
   39                         gpios = <&gpio 5 14 1>; /* GPO_P3 14, active low */
   40                         linux,default-trigger = "timer";
   41                         default-state = "off";
   42                 };
   43         };

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