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Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/input/samsung-keypad.txt | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/samsung-keypad.txt b/Documentation/devicetree/bindings/input/samsung-keypad.txt new file mode 100644 index 000000000000..ce3e394c0e64 --- /dev/null +++ b/Documentation/devicetree/bindings/input/samsung-keypad.txt @@ -0,0 +1,88 @@ +* Samsung's Keypad Controller device tree bindings + +Samsung's Keypad controller is used to interface a SoC with a matrix-type +keypad device. The keypad controller supports multiple row and column lines. +A key can be placed at each intersection of a unique row and a unique column. +The keypad controller can sense a key-press and key-release and report the +event using a interrupt to the cpu. + +Required SoC Specific Properties: +- compatible: should be one of the following + - "samsung,s3c6410-keypad": For controllers compatible with s3c6410 keypad + controller. + - "samsung,s5pv210-keypad": For controllers compatible with s5pv210 keypad + controller. + +- reg: physical base address of the controller and length of memory mapped + region. + +- interrupts: The interrupt number to the cpu. + +Required Board Specific Properties: +- samsung,keypad-num-rows: Number of row lines connected to the keypad + controller. + +- samsung,keypad-num-columns: Number of column lines connected to the + keypad controller. + +- row-gpios: List of gpios used as row lines. The gpio specifier for + this property depends on the gpio controller to which these row lines + are connected. + +- col-gpios: List of gpios used as column lines. The gpio specifier for + this property depends on the gpio controller to which these column + lines are connected. + +- Keys represented as child nodes: Each key connected to the keypad + controller is represented as a child node to the keypad controller + device node and should include the following properties. + - keypad,row: the row number to which the key is connected. + - keypad,column: the column number to which the key is connected. + - linux,code: the key-code to be reported when the key is pressed + and released. + +Optional Properties specific to linux: +- linux,keypad-no-autorepeat: do no enable autorepeat feature. +- linux,keypad-wakeup: use any event on keypad as wakeup event. + + +Example: + keypad@100A0000 { + compatible = "samsung,s5pv210-keypad"; + reg = <0x100A0000 0x100>; + interrupts = <173>; + samsung,keypad-num-rows = <2>; + samsung,keypad-num-columns = <8>; + linux,input-no-autorepeat; + linux,input-wakeup; + + row-gpios = <&gpx2 0 3 3 0 + &gpx2 1 3 3 0>; + + col-gpios = <&gpx1 0 3 0 0 + &gpx1 1 3 0 0 + &gpx1 2 3 0 0 + &gpx1 3 3 0 0 + &gpx1 4 3 0 0 + &gpx1 5 3 0 0 + &gpx1 6 3 0 0 + &gpx1 7 3 0 0>; + + key_1 { + keypad,row = <0>; + keypad,column = <3>; + linux,code = <2>; + }; + + key_2 { + keypad,row = <0>; + keypad,column = <4>; + linux,code = <3>; + }; + + key_3 { + keypad,row = <0>; + keypad,column = <5>; + linux,code = <4>; + }; + }; |