[PATCH v4] input: dt-bindings: ti,twl4030-keypad: convert to DT schema

[Jihed Chaibi <jihed.chaibi.dev@gmail.com>]

Convert the legacy TXT binding for the TWL4030 keypad module
to the modern YAML DT schema format. This adds formal validation
and improves documentation by inheriting from the matrix-keymap schema.

Signed-off-by: Jihed Chaibi <jihed.chaibi.dev@gmail.com>

---
Changes in v4:
 - No changes.
 - This patch is split from larger series per maintainer feedback.
 - v3 link:
    https://lore.kernel.org/all/20250816021523.167049-1-jihed.chaibi.dev@gmail.com/

Changes in v3:
 - Made 'linux,keymap' a required property as suggested by the reviewer.

Changes in v2:
 - Simplified the description field by removing redundant '|'
 as it does not affect formatting in this context.
---
 .../bindings/input/ti,twl4030-keypad.yaml     | 59 +++++++++++++++++++
 .../bindings/input/twl4030-keypad.txt         | 27 ---------
 2 files changed, 59 insertions(+), 27 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/ti,twl4030-keypad.yaml
 delete mode 100644 Documentation/devicetree/bindings/input/twl4030-keypad.txt

diff --git a/Documentation/devicetree/bindings/input/ti,twl4030-keypad.yaml b/Documentation/devicetree/bindings/input/ti,twl4030-keypad.yaml
new file mode 100644
index 000000000..c69aa7f5c
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/ti,twl4030-keypad.yaml
@@ -0,0 +1,59 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/ti,twl4030-keypad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments TWL4030-family Keypad Controller
+
+maintainers:
+  - Peter Ujfalusi <peter.ujfalusi@gmail.com>
+
+description:
+  TWL4030'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.
+
+allOf:
+  - $ref: matrix-keymap.yaml#
+
+properties:
+  compatible:
+    const: ti,twl4030-keypad
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - interrupts
+  - keypad,num-rows
+  - keypad,num-columns
+  - linux,keymap
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/input/input.h>
+
+    keypad {
+        compatible = "ti,twl4030-keypad";
+        interrupts = <1>;
+        keypad,num-rows = <8>;
+        keypad,num-columns = <8>;
+        linux,keymap = <
+            /* row 0 */
+            MATRIX_KEY(0, 0, KEY_1)
+            MATRIX_KEY(0, 1, KEY_2)
+            MATRIX_KEY(0, 2, KEY_3)
+
+            /* ...and so on for a full 8x8 matrix... */
+
+            /* row 7 */
+            MATRIX_KEY(7, 6, KEY_Y)
+            MATRIX_KEY(7, 7, KEY_Z)
+        >;
+    };
diff --git a/Documentation/devicetree/bindings/input/twl4030-keypad.txt b/Documentation/devicetree/bindings/input/twl4030-keypad.txt
deleted file mode 100644
index e4be2f76a..000000000
--- a/Documentation/devicetree/bindings/input/twl4030-keypad.txt
+++ /dev/null
@@ -1,27 +0,0 @@
-* TWL4030's Keypad Controller device tree bindings
-
-TWL4030'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.
-
-This binding is based on the matrix-keymap binding with the following
-changes:
-
- * keypad,num-rows and keypad,num-columns are required.
-
-Required SoC Specific Properties:
-- compatible: should be one of the following
-   - "ti,twl4030-keypad": For controllers compatible with twl4030 keypad
-      controller.
-- interrupt: should be one of the following
-   - <1>: For controllers compatible with twl4030 keypad controller.
-
-Example:
-	twl_keypad: keypad {
-		compatible = "ti,twl4030-keypad";
-		interrupts = <1>;
-		keypad,num-rows = <8>;
-		keypad,num-columns = <8>;
-	};
-- 
2.39.5