tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1NXP LPC32xx Key Scan Interface
2
3Required Properties:
4- compatible: Should be "nxp,lpc3220-key"
5- reg: Physical base address of the controller and length of memory mapped
6 region.
7- interrupts: The interrupt number to the cpu.
8- keypad,num-rows: Number of rows and columns, e.g. 1: 1x1, 6: 6x6
9- keypad,num-columns: Must be equal to keypad,num-rows since LPC32xx only
10 supports square matrices
11- nxp,debounce-delay-ms: Debounce delay in ms
12- nxp,scan-delay-ms: Repeated scan period in ms
13- linux,keymap: the key-code to be reported when the key is pressed
14 and released, see also
15 Documentation/devicetree/bindings/input/matrix-keymap.txt
16
17Example:
18
19 key@40050000 {
20 compatible = "nxp,lpc3220-key";
21 reg = <0x40050000 0x1000>;
22 interrupts = <54 0>;
23 keypad,num-rows = <1>;
24 keypad,num-columns = <1>;
25 nxp,debounce-delay-ms = <3>;
26 nxp,scan-delay-ms = <34>;
27 linux,keymap = <0x00000002>;
28 };