| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | NXP LPC32xx Key Scan Interface |
| 2 | |
| 3 | This binding is based on the matrix-keymap binding with the following |
| 4 | changes: |
| 5 | |
| 6 | Required Properties: |
| 7 | - compatible: Should be "nxp,lpc3220-key" |
| 8 | - reg: Physical base address of the controller and length of memory mapped |
| 9 | region. |
| 10 | - interrupts: The interrupt number to the cpu. |
| 11 | - clocks: phandle to clock controller plus clock-specifier pair |
| 12 | - nxp,debounce-delay-ms: Debounce delay in ms |
| 13 | - nxp,scan-delay-ms: Repeated scan period in ms |
| 14 | - linux,keymap: the key-code to be reported when the key is pressed |
| 15 | and released, see also |
| 16 | Documentation/devicetree/bindings/input/matrix-keymap.txt |
| 17 | |
| 18 | Note: keypad,num-rows and keypad,num-columns are required, and must be equal |
| 19 | since LPC32xx only supports square matrices |
| 20 | |
| 21 | Example: |
| 22 | |
| 23 | key@40050000 { |
| 24 | compatible = "nxp,lpc3220-key"; |
| 25 | reg = <0x40050000 0x1000>; |
| 26 | clocks = <&clk LPC32XX_CLK_KEY>; |
| 27 | interrupt-parent = <&sic1>; |
| 28 | interrupts = <22 IRQ_TYPE_LEVEL_HIGH>; |
| 29 | keypad,num-rows = <1>; |
| 30 | keypad,num-columns = <1>; |
| 31 | nxp,debounce-delay-ms = <3>; |
| 32 | nxp,scan-delay-ms = <34>; |
| 33 | linux,keymap = <0x00000002>; |
| 34 | }; |