aboutsummaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/input/lpc32xx-key.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/input/lpc32xx-key.txt')
-rw-r--r--Documentation/devicetree/bindings/input/lpc32xx-key.txt31
1 files changed, 31 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/lpc32xx-key.txt b/Documentation/devicetree/bindings/input/lpc32xx-key.txt
new file mode 100644
index 00000000..bcf62f85
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/lpc32xx-key.txt
@@ -0,0 +1,31 @@
+NXP LPC32xx Key Scan Interface
+
+This binding is based on the matrix-keymap binding with the following
+changes:
+
+Required Properties:
+- compatible: Should be "nxp,lpc3220-key"
+- reg: Physical base address of the controller and length of memory mapped
+ region.
+- interrupts: The interrupt number to the cpu.
+- nxp,debounce-delay-ms: Debounce delay in ms
+- nxp,scan-delay-ms: Repeated scan period in ms
+- linux,keymap: the key-code to be reported when the key is pressed
+ and released, see also
+ Documentation/devicetree/bindings/input/matrix-keymap.txt
+
+Note: keypad,num-rows and keypad,num-columns are required, and must be equal
+since LPC32xx only supports square matrices
+
+Example:
+
+ key@40050000 {
+ compatible = "nxp,lpc3220-key";
+ reg = <0x40050000 0x1000>;
+ interrupts = <54 0>;
+ keypad,num-rows = <1>;
+ keypad,num-columns = <1>;
+ nxp,debounce-delay-ms = <3>;
+ nxp,scan-delay-ms = <34>;
+ linux,keymap = <0x00000002>;
+ };