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/input/twl4030-keypad.txt

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    1 * TWL4030's Keypad Controller device tree bindings
    2 
    3 TWL4030's Keypad controller is used to interface a SoC with a matrix-type
    4 keypad device. The keypad controller supports multiple row and column lines.
    5 A key can be placed at each intersection of a unique row and a unique column.
    6 The keypad controller can sense a key-press and key-release and report the
    7 event using a interrupt to the cpu.
    8 
    9 This binding is based on the matrix-keymap binding with the following
   10 changes:
   11 
   12  * keypad,num-rows and keypad,num-columns are required.
   13 
   14 Required SoC Specific Properties:
   15 - compatible: should be one of the following
   16    - "ti,twl4030-keypad": For controllers compatible with twl4030 keypad
   17       controller.
   18 - interrupt: should be one of the following
   19    - <1>: For controllers compatible with twl4030 keypad controller.
   20 
   21 Example:
   22         twl_keypad: keypad {
   23                 compatible = "ti,twl4030-keypad";
   24                 interrupts = <1>;
   25                 keypad,num-rows = <8>;
   26                 keypad,num-columns = <8>;
   27         };

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