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| author | AnilKumar Ch <anilkumar@ti.com> | 2012-11-21 07:49:31 +0100 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-11-21 07:55:10 +0100 |
| commit | 4a83eecff65bd327bf5cb3b400b96fa975c73308 (patch) | |
| tree | 78e4fabcc1cc60875a6a557a215bc93c110e4536 /Documentation | |
| parent | Input: marix-keymap - automatically allocate memory for keymap (diff) | |
| download | linux-4a83eecff65bd327bf5cb3b400b96fa975c73308.tar.xz linux-4a83eecff65bd327bf5cb3b400b96fa975c73308.zip | |
Input: matrix-keypad - add device tree support
Also the driver was modifued to take advantage of recent improvements in
matrix_keypad_build_keymap() implementation, which automatically allocates
memory for keymap.
The driver was tested on AM335x EVM.
Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt new file mode 100644 index 000000000000..ead641c65e0a --- /dev/null +++ b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt @@ -0,0 +1,46 @@ +* GPIO driven matrix keypad device tree bindings + +GPIO driven matrix keypad is used to interface a SoC with a matrix keypad. +The matrix keypad supports multiple row and column lines, a key can be +placed at each intersection of a unique row and a unique column. The matrix +keypad can sense a key-press and key-release by means of GPIO lines and +report the event using GPIO interrupts to the cpu. + +Required Properties: +- compatible: Should be "gpio-matrix-keypad" +- 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. +- linux,keymap: The definition can be found at + bindings/input/matrix-keymap.txt + +Optional Properties: +- linux,no-autorepeat: do no enable autorepeat feature. +- linux,wakeup: use any event on keypad as wakeup event. +- debounce-delay-ms: debounce interval in milliseconds +- col-scan-delay-us: delay, measured in microseconds, that is needed + before we can scan keypad after activating column gpio + +Example: + matrix-keypad { + compatible = "gpio-matrix-keypad"; + debounce-delay-ms = <5>; + col-scan-delay-us = <2>; + + row-gpios = <&gpio2 25 0 + &gpio2 26 0 + &gpio2 27 0>; + + col-gpios = <&gpio2 21 0 + &gpio2 22 0>; + + linux,keymap = <0x0000008B + 0x0100009E + 0x02000069 + 0x0001006A + 0x0101001C + 0x0201006C>; + }; |