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This is a driver for the key scan interface of the LPC32xx SoC Signed-off-by: Roland Stigge <stigge@antcom.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
29 lines
902 B
Plaintext
29 lines
902 B
Plaintext
NXP LPC32xx Key Scan Interface
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Required Properties:
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- compatible: Should be "nxp,lpc3220-key"
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- reg: Physical base address of the controller and length of memory mapped
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region.
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- interrupts: The interrupt number to the cpu.
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- keypad,num-rows: Number of rows and columns, e.g. 1: 1x1, 6: 6x6
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- keypad,num-columns: Must be equal to keypad,num-rows since LPC32xx only
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supports square matrices
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- nxp,debounce-delay-ms: Debounce delay in ms
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- nxp,scan-delay-ms: Repeated scan period in ms
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- linux,keymap: the key-code to be reported when the key is pressed
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and released, see also
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Documentation/devicetree/bindings/input/matrix-keymap.txt
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Example:
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key@40050000 {
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compatible = "nxp,lpc3220-key";
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reg = <0x40050000 0x1000>;
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interrupts = <54 0>;
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keypad,num-rows = <1>;
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keypad,num-columns = <1>;
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nxp,debounce-delay-ms = <3>;
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nxp,scan-delay-ms = <34>;
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linux,keymap = <0x00000002>;
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};
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