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authorThomas Abraham <thomas.abraham@linaro.org>2011-11-02 19:37:22 +0900
committerKukjin Kim <kgene.kim@samsung.com>2011-12-23 10:07:10 +0900
commitb3d6ac3e5f937440a362c0fa187257fa1197f5b9 (patch)
treef9d535987acc864a3948174e893077b5f6543138 /Documentation/devicetree/bindings/input
parent8742e0441d6530d40d85d65a6bcc5a6c0c4eab13 (diff)
input: samsung-keypad: Add device tree support
Add device tree based discovery support for Samsung's keypad controller. Cc: Joonyoung Shim <jy0922.shim@samsung.com> Cc: Donghwa Lee <dh09.lee@samsung.com> Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
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+* 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>;
+ };
+ };

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