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-clps711x.txt

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    1 Cirrus Logic CLPS711X GPIO controller
    2 
    3 Required properties:
    4 - compatible: Should be "cirrus,ep7209-gpio"
    5 - reg: Physical base GPIO controller registers location and length.
    6   There should be two registers, first is DATA register, the second
    7   is DIRECTION.
    8 - gpio-controller: Marks the device node as a gpio controller.
    9 - #gpio-cells: Should be two. The first cell is the pin number and
   10   the second cell is used to specify the gpio polarity:
   11     0 = active high
   12     1 = active low
   13 
   14 Note: Each GPIO port should have an alias correctly numbered in "aliases"
   15 node.
   16 
   17 Example:
   18 
   19 aliases {
   20         gpio0 = &porta;
   21 };
   22 
   23 porta: gpio@80000000 {
   24         compatible = "cirrus,ep7312-gpio","cirrus,ep7209-gpio";
   25         reg = <0x80000000 0x1>, <0x80000040 0x1>;
   26         gpio-controller;
   27         #gpio-cells = <2>;
   28 };

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