[PATCH 1/2] devicetree: bindings: Add keypad driver ducumentation

[Wenhua Lin <Wenhua.Lin@unisoc.com>]

Add keypad driver ducumentation.

Signed-off-by: Wenhua Lin <Wenhua.Lin@unisoc.com>
---
 .../bindings/input/sprd-keypad.yaml           | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/sprd-keypad.yaml

diff --git a/Documentation/devicetree/bindings/input/sprd-keypad.yaml b/Documentation/devicetree/bindings/input/sprd-keypad.yaml
new file mode 100644
index 000000000000..51710e1eb389
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/sprd-keypad.yaml
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2023 Unisoc Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/sprd-keypad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Device-Tree bindings for GPIO attached keys
+
+maintainers:
+  - Orson Zhai <orsonzhai@gmail.com>
+  - Baolin Wang <baolin.wang7@gmail.com>
+  - Chunyan Zhang <zhang.lyra@gmail.com>
+
+description: |
+    Keypad controller is used to interface a SoC with a matrix-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:
+    const: sprd,sc9860-keypad
+
+    reg:
+        maxItems: 1
+
+    interrupts:
+        maxItems: 1
+
+    keypad,num-rows:
+    description: Number of row lines connected to the keypad controller.
+
+    keypad,num-columns:
+    description: Number of column lines connected to the keypad.
+
+    debounce-interval:
+    description:
+        Debouncing interval time in milliseconds. If not specified defaults to 5.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+    default: 5
+
+    linux,keymap:
+    description: An array of packed 1-cell entries containing the equivalent
+        of row, column and linux key-code. The 32-bit big endian cell is packed.
+
+required:
+        - compatible
+        - reg
+        - keypad,num-rows
+        - keypad,num-columns
+        - linux,keymap
+
+unevaluatedProperties: false
+
+
+examples:
+  - |
+	keypad@40250000 {
+		compatible = "sprd,sc9860-keypad";
+		reg = 	<0x40250000 0x1000>;
+		interrupts = <GIC_SPI 36 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&aonapb_gate CLK_KPD_EB>,
+			<&aonapb_gate CLK_KPD_RTC_EB>;
+		clock-names = "enable", "rtc";
+		keypad,num-rows= <3>;
+		keypad,num-columns = <3>;
+		debounce-interval = <5>;
+		linux,keymap = < 0x00000001
+				 0x01000002
+				 0x00020003>;
+		status = "okay";
+	};
+...
-- 
2.17.1