dt-bindings: input: Add binding for cypress-sf

Add a device tree binding for Cypress StreetFighter.
Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210907174341.422013-3-y.oudjana@protonmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/cypress-sf.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/cypress-sf.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cypress StreetFighter touchkey controller
+
+maintainers:
+  - Yassine Oudjana <y.oudjana@protonmail.com>
+
+allOf:
+  - $ref: input.yaml#
+
+properties:
+  compatible:
+    const: cypress,sf3155
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  avdd-supply:
+    description: Regulator for AVDD analog voltage
+
+  vdd-supply:
+    description: Regulator for VDD digital voltage
+
+  linux,keycodes:
+    minItems: 1
+    maxItems: 8
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - avdd-supply
+  - vdd-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/input/input.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchkey@28 {
+                compatible = "cypress,sf3155";
+                reg = <0x28>;
+                interrupt-parent = <&msmgpio>;
+                interrupts = <77 IRQ_TYPE_EDGE_FALLING>;
+                avdd-supply = <&vreg_l6a_1p8>;
+                vdd-supply = <&vdd_3v2_tp>;
+                linux,keycodes = <KEY_BACK KEY_MENU>;
+        };
+    };

MAINTAINERS

@@ -5010,6 +5010,7 @@ CYPRESS STREETFIGHTER TOUCHKEYS DRIVER
 M:	Yassine Oudjana <y.oudjana@protonmail.com>
 L:	linux-input@vger.kernel.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/input/cypress-sf.yaml
 F:	drivers/input/keyboard/cypress-sf.c
 
 CYTTSP TOUCHSCREEN DRIVER