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authorAnilKumar Ch <anilkumar@ti.com>2012-11-20 22:49:31 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2012-11-20 22:55:10 -0800
commit4a83eecff65bd327bf5cb3b400b96fa975c73308 (patch)
tree78e4fabcc1cc60875a6a557a215bc93c110e4536 /Documentation/devicetree/bindings/input
parent5383116b86d8e877684770d05acd1dda62be102d (diff)
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/devicetree/bindings/input')
-rw-r--r--Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt46
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diff --git a/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
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+++ 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>;
+ };