[PATCH V2 1/2] Documentation: devicetree: bindings: input

[fengping yu <fengping.yu@mediatek.com>]

From: "fengping.yu" <fengping.yu@mediatek.com>

Add mtk keypad device tree documentation.

Change-Id: I415b76ee980784992763c768829b2dda76699dea
Signed-off-by: fengping.yu <fengping.yu@mediatek.com>
---
 .../devicetree/bindings/input/mtk-kpd.txt     | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/mtk-kpd.txt

diff --git a/Documentation/devicetree/bindings/input/mtk-kpd.txt b/Documentation/devicetree/bindings/input/mtk-kpd.txt
new file mode 100644
index 000000000000..2af81e696159
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/mtk-kpd.txt
@@ -0,0 +1,45 @@
+* Mediatek's Keypad Controller device tree binding
+
+Mediatek'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 properties:
+- compatible should contain:
+	* "mediatek,mt6779-keypad" for MT6779 keypad
+	* "mediatek,kp" for common keypad
+
+- reg: The base address of the Keypad register bank.
+
+- interrupts: A single interrupt specifier.
+
+- mediatek,key-debounce-ms: Debounce interval in milliseconds, maximum value
+  is 256ms
+
+- mediatek,hw-map-num: Number of entries of keycode in mediatek,hw-init-map
+
+- mediatek,hw-init-map: An array of packed 1-cell entries containing the
+  equivalent of hw-map-num linux key-code. Each cell is Linux keymap of
+  corresponding row/col, arrange like this:
+
+  row0col0, row0col1, row0col2,...row0col8,
+  row1col0, row1col1, row1col2,...row1col8,
+  ...
+  row7col0, row7col1, row7col2,...row7col8.
+
+Example:
+
+	keypad: kp@10010000 {
+		compatible = "mediatek,mt6779-keypad", "mediatek,kp";
+		reg = <0 0x10010000 0 0x1000>;
+		interrupts = <GIC_SPI 75 IRQ_TYPE_EDGE_FALLING>;
+	};
+
+	&keypad {
+		mediatek,key-debounce-ms = <1024>;
+		/*HW Keycode [0~71] -> Linux Keycode*/
+		mediatek,khw-map-num = <72>;
+		mediatek,hw-init-map = <114 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 >;
+	};
-- 
2.18.0
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