dt-bindings: input: Add DT bindings ep93xx keypad

Add YAML bindings ep93xx SoC.

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>

diff --git a/Documentation/devicetree/bindings/input/cirrus,ep93xx-keypad.yaml b/Documentation/devicetree/bindings/input/cirrus,ep93xx-keypad.yaml
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/cirrus,ep93xx-keypad.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cirrus ep93xx keypad
+
+maintainers:
+  - Dmitry Torokhov <dmitry.torokhov@gmail.com>
+  - Alexander Sverdlin <alexander.sverdlin@gmail.com>
+
+allOf:
+  - $ref: "/schemas/input/matrix-keymap.yaml#"
+
+description: |
+  The KPP is designed to interface with a keypad matrix with 2-point contact
+  or 3-point contact keys. The KPP is designed to simplify the software task
+  of scanning a keypad matrix. The KPP is capable of detecting, debouncing,
+  and decoding one or multiple keys pressed simultaneously on a keypad.
+
+properties:
+  compatible:
+    enum:
+      - cirrus,ep93xx-keypad
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    enum:
+      - ep93xx-keypad
+
+  debounce:
+    description: |
+          Time in microseconds that key must be pressed or
+          released for state change interrupt to trigger.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  prescale:
+    description: row/column counter pre-scaler load value
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  clk-rate:
+    description: clock rate setting
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  disable-3-key:
+    type: boolean
+    description:
+      Disable 3 Key reset. Setting this disables the three key reset
+      output to the watchdog reset block.
+
+  diag-mode:
+    type: boolean
+    description:
+      Key scan diagnostic mode. Setting this allows key scanning to be
+      directly controlled through the key register by writes from the
+      ARM Core.
+
+  back-drive:
+    type: boolean
+    description:
+      Key scan back driving enable. Setting this enables the key
+      scanning logic to back drive the row and column pins of the
+      chip high during the first two column counts in the
+      row/column counter.
+
+  test-mode:
+    type: boolean
+    description:
+      Test mode. When this is set, the counter RC_COUNT is advanced
+      by 8 counts when EN is active. The effect is that only column 0
+      is checked in each row. This test mode allows a faster test
+      of the ROW pins.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - linux,keymap
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/cirrus,ep93xx-clock.h>
+    keypad@800f0000 {
+        compatible = "cirrus,ep93xx-keypad";
+        reg = <0x800f0000 0x0c>;
+        interrupt-parent = <&vic0>;
+        interrupts = <29>;
+        clocks = <&syscon EP93XX_CLK_KEYPAD>;
+        clock-names = "ep93xx-keypad";
+        pinctrl-names = "default";
+        pinctrl-0 = <&keypad_default_pins>;
+        linux,keymap = <0x00000067     /* KEY_UP */
+                        0x0001006c     /* KEY_DOWN */
+                        0x00020072     /* KEY_VOLUMEDOWN */
+                        0x00030066     /* KEY_HOME */
+                        0x0100006a     /* KEY_RIGHT */
+                        0x01010069     /* KEY_LEFT */
+                        0x0102001c     /* KEY_ENTER */
+                        0x01030073     /* KEY_VOLUMEUP */
+                        0x02000040     /* KEY_F6 */
+                        0x02010042     /* KEY_F8 */
+                        0x02020043     /* KEY_F9 */
+                        0x02030044     /* KEY_F10 */
+                        0x0300003b     /* KEY_F1 */
+                        0x0301003c     /* KEY_F2 */
+                        0x0302003d     /* KEY_F3 */
+                        0x03030074>;   /* KEY_POWER */
+    };
+