dt-bindings: input: Convert mtk-pmic-keys to DT schema

Convert the mtk-pmic-keys to DT schema format.

The old binding was missing documentation for key press/release
interrupts, even though it was supported in hardware and driver,
so support for the same was added during the conversion.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220914103021.43593-2-angelogioacchino.delregno@collabora.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/mediatek,pmic-keys.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/mediatek,pmic-keys.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek PMIC Keys
+
+maintainers:
+  - Chen Zhong <chen.zhong@mediatek.com>
+
+allOf:
+  - $ref: input.yaml#
+
+description: |
+  There are two key functions provided by MT6397, MT6323 and other MediaTek
+  PMICs: pwrkey and homekey.
+  The key functions are defined as the subnode of the function node provided
+  by the PMIC that is defined as a Multi-Function Device (MFD).
+
+  For MediaTek MT6323/MT6397 PMIC bindings see
+  Documentation/devicetree/bindings/mfd/mt6397.txt
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt6323-keys
+      - mediatek,mt6358-keys
+      - mediatek,mt6397-keys
+
+  power-off-time-sec: true
+
+  mediatek,long-press-mode:
+    description: |
+      Key long-press force shutdown setting
+      0 - disabled
+      1 - pwrkey
+      2 - pwrkey+homekey
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 0
+    maximum: 2
+
+patternProperties:
+  "^((power|home)|(key-[a-z0-9-]+|[a-z0-9-]+-key))$":
+    $ref: input.yaml#
+
+    properties:
+      interrupts:
+        minItems: 1
+        items:
+          - description: Key press interrupt
+          - description: Key release interrupt
+
+      interrupt-names: true
+
+      linux-keycodes:
+        maxItems: 1
+
+      wakeup-source: true
+
+    required:
+      - linux,keycodes
+
+    if:
+      properties:
+        interrupt-names:
+          contains:
+            const: powerkey
+    then:
+      properties:
+        interrupt-names:
+          minItems: 1
+          items:
+            - const: powerkey
+            - const: powerkey_r
+    else:
+      properties:
+        interrupt-names:
+          minItems: 1
+          items:
+            - const: homekey
+            - const: homekey_r
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/input/input.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    pmic {
+        compatible = "mediatek,mt6397";
+
+        keys {
+          compatible = "mediatek,mt6397-keys";
+          mediatek,long-press-mode = <1>;
+          power-off-time-sec = <0>;
+
+          key-power {
+            linux,keycodes = <KEY_POWER>;
+            wakeup-source;
+          };
+
+          key-home {
+            linux,keycodes = <KEY_VOLUMEDOWN>;
+          };
+        };
+    };

Documentation/devicetree/bindings/input/mtk-pmic-keys.txt

-MediaTek MT6397/MT6323 PMIC Keys Device Driver
-
-There are two key functions provided by MT6397/MT6323 PMIC, pwrkey
-and homekey. The key functions are defined as the subnode of the function
-node provided by MT6397/MT6323 PMIC that is being defined as one kind
-of Muti-Function Device (MFD)
-
-For MT6397/MT6323 MFD bindings see:
-Documentation/devicetree/bindings/mfd/mt6397.txt
-
-Required properties:
-- compatible: Should be one of:
-	- "mediatek,mt6397-keys"
-	- "mediatek,mt6323-keys"
-	- "mediatek,mt6358-keys"
-- linux,keycodes: See Documentation/devicetree/bindings/input/input.yaml
-
-Optional Properties:
-- wakeup-source: See Documentation/devicetree/bindings/power/wakeup-source.txt
-- mediatek,long-press-mode: Long press key shutdown setting, 1 for
-	pwrkey only, 2 for pwrkey/homekey together, others for disabled.
-- power-off-time-sec: See Documentation/devicetree/bindings/input/input.yaml
-
-Example:
-
-	pmic: mt6397 {
-		compatible = "mediatek,mt6397";
-
-		...
-
-		mt6397keys: mt6397keys {
-			compatible = "mediatek,mt6397-keys";
-			mediatek,long-press-mode = <1>;
-			power-off-time-sec = <0>;
-
-			power {
-				linux,keycodes = <116>;
-				wakeup-source;
-			};
-
-			home {
-				linux,keycodes = <114>;
-			};
-		};
-
-	};