dt-bindings: input: adp5588: add bindings

Add device tree bindings for the adp5588-keys driver.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220829131553.690063-6-nuno.sa@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/adi,adp5588.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/adi,adp5588.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices ADP5588 Keypad Controller
+
+maintainers:
+  - Nuno Sá <nuno.sa@analog.com>
+
+description: |
+  Analog Devices Mobile I/O Expander and QWERTY Keypad Controller
+  https://www.analog.com/media/en/technical-documentation/data-sheets/ADP5588.pdf
+
+allOf:
+  - $ref: matrix-keymap.yaml#
+  - $ref: input.yaml#
+
+properties:
+  compatible:
+    enum:
+      - adi,adp5587
+      - adi,adp5588
+
+  reg:
+    maxItems: 1
+
+  vcc-supply:
+    description: Supply Voltage Input
+
+  reset-gpios:
+    description:
+      If specified, it will be asserted during driver probe. As the line is
+      active low, it should be marked GPIO_ACTIVE_LOW.
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  gpio-controller:
+    description:
+      This property applies if either keypad,num-rows lower than 8 or
+      keypad,num-columns lower than 10.
+
+  '#gpio-cells':
+    const: 2
+
+  interrupt-controller:
+    description:
+      This property applies if either keypad,num-rows lower than 8 or
+      keypad,num-columns lower than 10.
+
+  '#interrupt-cells':
+    const: 2
+
+  adi,unlock-keys:
+    description:
+      Specifies a maximum of 2 keys that can be used to unlock the keypad.
+      If this property is set, the keyboard will be locked and only unlocked
+      after these keys are pressed. If only one key is set, a double click is
+      needed to unlock the keypad. The value of this property cannot be bigger
+      or equal than keypad,num-rows * keypad,num-columns.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 2
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - keypad,num-rows
+  - keypad,num-columns
+  - linux,keymap
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/input/input.h>
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        keys@34 {
+            compatible = "adi,adp5588";
+            reg = <0x34>;
+
+            vcc-supply = <&vcc>;
+            interrupts = <21 IRQ_TYPE_EDGE_FALLING>;
+            interrupt-parent = <&gpio>;
+            reset-gpios = <&gpio 20 GPIO_ACTIVE_LOW>;
+
+            keypad,num-rows = <1>;
+            keypad,num-columns = <9>;
+            linux,keymap = <
+                MATRIX_KEY(0x00, 0x00, KEY_1)
+                MATRIX_KEY(0x00, 0x01, KEY_2)
+                MATRIX_KEY(0x00, 0x02, KEY_3)
+                MATRIX_KEY(0x00, 0x03, KEY_4)
+                MATRIX_KEY(0x00, 0x04, KEY_5)
+                MATRIX_KEY(0x00, 0x05, KEY_6)
+                MATRIX_KEY(0x00, 0x06, KEY_7)
+                MATRIX_KEY(0x00, 0x07, KEY_8)
+                MATRIX_KEY(0x00, 0x08, KEY_9)
+            >;
+        };
+    };
+...

MAINTAINERS

@@ -556,6 +556,7 @@ M:	Michael Hennerich <michael.hennerich@analog.com>
 S:	Supported
 W:	http://wiki.analog.com/ADP5588
 W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/input/adi,adp5588.yaml
 F:	drivers/input/keyboard/adp5588-keys.c
 
 ADP8860 BACKLIGHT DRIVER (ADP8860/ADP8861/ADP8863)