[PATCH v17 1/3] dt-bindings: Add bindings for Mediatek matrix keypad

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

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

This patch add devicetree bindings for Mediatek matrix keypad driver.

Signed-off-by: fengping.yu <fengping.yu@mediatek.com>
---
 .../devicetree/bindings/input/mtk-kpd.yaml    | 87 +++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/mtk-kpd.yaml

diff --git a/Documentation/devicetree/bindings/input/mtk-kpd.yaml b/Documentation/devicetree/bindings/input/mtk-kpd.yaml
new file mode 100644
index 000000000000..d74dd8a6fbde
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/mtk-kpd.yaml
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+version: 1
+
+$id: http://devicetree.org/schemas/input/mtk-keypad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek's Keypad Controller device tree bindings
+
+maintainer:
+  - Fengping Yu <fengping.yu@mediatek.com>
+
+description: |
+  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.
+
+properties:
+  compatible:
+    oneOf:
+      - const: "mediatek,mt6779-keypad"
+      - const: "mediatek,mt6873-keypad"
+
+  clock-names:
+    description: Names of the clocks listed in clocks property in the same order
+    maxItems: 1
+    items:
+    	- const: kpd
+
+  clocks:
+    description: Must contain one entry, for the module clock
+    refs: devicetree/bindings/clocks/clock-bindings.txt for details.
+
+  interrupts:
+    description: A single interrupt specifier
+    maxItems: 1
+
+  linux,keymap:
+    description: The keymap for keys as described in the binding document
+    refs: devicetree/bindings/input/matrix-keymap.txt
+    minItems: 1
+
+  reg:
+    description: The base address of the Keypad register bank
+    maxItems: 1
+
+  wakeup-source:
+    description: use any event on keypad as wakeup event
+    type: boolean
+
+  keypad,num-columns:
+    description: Number of column lines connected to the keypad controller,
+    it is not equal to PCB columns number, instead you should add required value
+    for each IC. If not specified, the default value is 1.
+
+  keypad,num-rows:
+    description: Number of row lines connected to the keypad controller, it is
+    not equal to PCB rows number, instead you should add required value for each IC.
+    If not specified, the default value is 1.
+
+  mediatek,debounce-us:
+    description: Debounce interval in microseconds, if not specified, the default
+    value is 16000
+    maximum: 256000
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - linux,keymap
+  - clocks
+  - clock-names
+
+examples:
+  - |
+
+  kp@10010000 {
+    compatible = "mediatek,mt6779-keypad";
+    reg = <0 0x10010000 0 0x1000>;
+    linux,keymap = < MATRIX_KEY(0x00, 0x00, KEY_VOLUMEDOWN) >;
+    interrupts = <GIC_SPI 75 IRQ_TYPE_EDGE_FALLING>;
+    clocks = <&clk26m>;
+    clock-names = "kpd";
+  };
-- 
2.18.0
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