projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b3d6ac3e TA |
1 | * Samsung's Keypad Controller device tree bindings |
| 2 | ||
| 3 | Samsung'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 | Required SoC Specific Properties: | |
| 10 | - compatible: should be one of the following | |
| 11 | - "samsung,s3c6410-keypad": For controllers compatible with s3c6410 keypad | |
| 12 | controller. | |
| 13 | - "samsung,s5pv210-keypad": For controllers compatible with s5pv210 keypad | |
| 14 | controller. | |
| 15 | ||
| 16 | - reg: physical base address of the controller and length of memory mapped | |
| 17 | region. | |
| 18 | ||
| 19 | - interrupts: The interrupt number to the cpu. | |
| 20 | ||
| 21 | Required Board Specific Properties: | |
| 22 | - samsung,keypad-num-rows: Number of row lines connected to the keypad | |
| 23 | controller. | |
| 24 | ||
| 25 | - samsung,keypad-num-columns: Number of column lines connected to the | |
| 26 | keypad controller. | |
| 27 | ||
| 28 | - row-gpios: List of gpios used as row lines. The gpio specifier for | |
| 29 | this property depends on the gpio controller to which these row lines | |
| 30 | are connected. | |
| 31 | ||
| 32 | - col-gpios: List of gpios used as column lines. The gpio specifier for | |
| 33 | this property depends on the gpio controller to which these column | |
| 34 | lines are connected. | |
| 35 | ||
| 36 | - Keys represented as child nodes: Each key connected to the keypad | |
| 37 | controller is represented as a child node to the keypad controller | |
| 38 | device node and should include the following properties. | |
| 39 | - keypad,row: the row number to which the key is connected. | |
| 40 | - keypad,column: the column number to which the key is connected. | |
| 41 | - linux,code: the key-code to be reported when the key is pressed | |
| 42 | and released. | |
| 43 | ||
| 44 | Optional Properties specific to linux: | |
| 45 | - linux,keypad-no-autorepeat: do no enable autorepeat feature. | |
| 46 | - linux,keypad-wakeup: use any event on keypad as wakeup event. | |
| 47 | ||
| 48 | ||
| 49 | Example: | |
| 50 | keypad@100A0000 { | |
| 51 | compatible = "samsung,s5pv210-keypad"; | |
| 52 | reg = <0x100A0000 0x100>; | |
| 53 | interrupts = <173>; | |
| 54 | samsung,keypad-num-rows = <2>; | |
| 55 | samsung,keypad-num-columns = <8>; | |
| 56 | linux,input-no-autorepeat; | |
| 57 | linux,input-wakeup; | |
| 58 | ||
| 59 | row-gpios = <&gpx2 0 3 3 0 | |
| 60 | &gpx2 1 3 3 0>; | |
| 61 | ||
| 62 | col-gpios = <&gpx1 0 3 0 0 | |
| 63 | &gpx1 1 3 0 0 | |
| 64 | &gpx1 2 3 0 0 | |
| 65 | &gpx1 3 3 0 0 | |
| 66 | &gpx1 4 3 0 0 | |
| 67 | &gpx1 5 3 0 0 | |
| 68 | &gpx1 6 3 0 0 | |
| 69 | &gpx1 7 3 0 0>; | |
| 70 | ||
| 71 | key_1 { | |
| 72 | keypad,row = <0>; | |
| 73 | keypad,column = <3>; | |
| 74 | linux,code = <2>; | |
| 75 | }; | |
| 76 | ||
| 77 | key_2 { | |
| 78 | keypad,row = <0>; | |
| 79 | keypad,column = <4>; | |
| 80 | linux,code = <3>; | |
| 81 | }; | |
| 82 | ||
| 83 | key_3 { | |
| 84 | keypad,row = <0>; | |
| 85 | keypad,column = <5>; | |
| 86 | linux,code = <4>; | |
| 87 | }; | |
| 88 | }; |