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