path: root/dts/Bindings/input/gpio-matrix-keypad.txt
diff options
authorSascha Hauer <>2014-04-25 11:22:32 +0200
committerSascha Hauer <>2014-04-28 09:08:46 +0200
commit00ce25c6dcdae5582ae4be37147ab33678adc995 (patch)
tree41c93102ae304a61738c31353e3cb5336ef0b297 /dts/Bindings/input/gpio-matrix-keypad.txt
parent0af79fbb6779921d3f1962773adb7fb57d3c89d4 (diff)
Add devicetree source files as of Linux-3.15-rc2
This adds the Linux dts files to barebox. The dts files are generated from Ian Campbells device-tree-rebasing.git: git:// The dts are found in dts/ in the barebox repository and will be updated from upstream regularly, probably for each upstream -rc. To keep the synchronization with upstream easy no changes to the original files are allowed under dts/. Instead changes to upstream dts files will be done using overlays in arch/$ARCH/dts/. Signed-off-by: Sascha Hauer <>
Diffstat (limited to 'dts/Bindings/input/gpio-matrix-keypad.txt')
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diff --git a/dts/Bindings/input/gpio-matrix-keypad.txt b/dts/Bindings/input/gpio-matrix-keypad.txt
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+* 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
+ 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>;
+ };