[PATCH v2 1/2] dt-bindings: input: Add Nuvoton MA35D1 keypad controller

[Feng-Yi Hsueh <fyhsueh4linux@gmail.com>]

Document the Nuvoton MA35D1 hardware matrix keypad controller.

The controller supports up to eight rows and eight columns
and generates interrupts for key press and release events.

Signed-off-by: Feng-Yi Hsueh <fyhsueh4linux@gmail.com>
---
 .../bindings/input/nuvoton,ma35d1-keypad.yaml | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/nuvoton,ma35d1-keypad.yaml

diff --git a/Documentation/devicetree/bindings/input/nuvoton,ma35d1-keypad.yaml b/Documentation/devicetree/bindings/input/nuvoton,ma35d1-keypad.yaml
new file mode 100644
index 000000000000..ff4f94166f0e
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/nuvoton,ma35d1-keypad.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/nuvoton,ma35d1-keypad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton MA35D1 Matrix Keypad Controller
+
+maintainers:
+  - Feng-Yi Hsueh <fyhsueh4linux@gmail.com>
+
+description: |
+  The Nuvoton MA35D1 keypad controller scans a matrix of up to eight rows
+  and eight columns and reports key press and release interrupts.
+
+allOf:
+  - $ref: /schemas/input/matrix-keymap.yaml#
+  - $ref: /schemas/input/input.yaml#
+
+properties:
+  compatible:
+    const: nuvoton,ma35d1-keypad
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  keypad,num-rows:
+    minimum: 2
+    maximum: 8
+
+  keypad,num-columns:
+    minimum: 1
+    maximum: 8
+
+  autorepeat: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - keypad,num-rows
+  - keypad,num-columns
+  - linux,keymap
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/nuvoton,ma35d1-clk.h>
+    #include <dt-bindings/input/input.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    keypad@404a0000 {
+        compatible = "nuvoton,ma35d1-keypad";
+        reg = <0x404a0000 0x10000>;
+        interrupts = <GIC_SPI 79 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk KPI_GATE>;
+
+        keypad,num-rows = <4>;
+        keypad,num-columns = <1>;
+        linux,keymap = <MATRIX_KEY(0, 0, KEY_1)
+                        MATRIX_KEY(1, 0, KEY_2)
+                        MATRIX_KEY(2, 0, KEY_3)
+                        MATRIX_KEY(3, 0, KEY_4)>;
+    };
-- 
2.43.0