FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/input/lpc32xx-key.txt

     NXP LPC32xx Key Scan Interface
     
     This binding is based on the matrix-keymap binding with the following
     changes:
     
     Required Properties:
     - compatible: Should be "nxp,lpc3220-key"
     - reg: Physical base address of the controller and length of memory mapped
       region.
    - interrupts: The interrupt number to the cpu.
    - clocks: phandle to clock controller plus clock-specifier pair
    - nxp,debounce-delay-ms: Debounce delay in ms
    - nxp,scan-delay-ms: Repeated scan period in ms
    - linux,keymap: the key-code to be reported when the key is pressed
      and released, see also
      Documentation/devicetree/bindings/input/matrix-keymap.txt
    
    Note: keypad,num-rows and keypad,num-columns are required, and must be equal
    since LPC32xx only supports square matrices
    
    Example:
    
            key@40050000 {
                    compatible = "nxp,lpc3220-key";
                    reg = <0x40050000 0x1000>;
                    clocks = <&clk LPC32XX_CLK_KEY>;
                    interrupt-parent = <&sic1>;
                    interrupts = <22 IRQ_TYPE_LEVEL_HIGH>;
                    keypad,num-rows = <1>;
                    keypad,num-columns = <1>;
                    nxp,debounce-delay-ms = <3>;
                    nxp,scan-delay-ms = <34>;
                    linux,keymap = <0x00000002>;
            };

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