[PATCH v7 1/2] dt-bindings: input: touchscreen: add Hynitron CST816X

[Oleh Kuzhylnyi <kuzhylol@gmail.com>]

Add documentation for the Hynitron CST816X touchscreen bindings.

Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Oleh Kuzhylnyi <kuzhylol@gmail.com>
---

Changes in v7:
 - Introduce the gestures field along with its sub-fields
 - Make reset-gpio property optional
 - Extend main description
 - Remove "touchscreen" reference

Changes in v6:
 - Fix minor tweak adviced by Krzysztof:
 - Move additionalProperties field after required

Changes in v5:
 - No code changes

Changes in v4:
 - Add Conor's Dooley "Reviewed-by" tag

Changes in v3:
 - Rename filename to hynitron,cst816s.yaml
 - Update description with display details

Changes in v2:
 - Apply pin definitions and DT headers
 - Use generic name for DT node
 - Drop status field

 .../input/touchscreen/hynitron,cst816s.yaml   | 126 ++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml

diff --git a/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml b/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml
new file mode 100644
index 000000000000..99ac29da7a5a
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816s.yaml
@@ -0,0 +1,126 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/hynitron,cst816s.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hynitron CST816S Touchscreen controller
+
+description:
+  The CST816S is a touchscreen controller from Hynitron, which supports gesture
+  recognition for swipe directions, tap, and long-press actions. This binding
+  document defines the necessary properties for integrating the CST816S with
+  a Linux system.
+
+maintainers:
+  - Oleh Kuzhylnyi <kuzhylol@gmail.com>
+
+properties:
+  compatible:
+    enum:
+      - hynitron,cst816s
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      Optional GPIO line used to reset the touchscreen controller.
+    optional: true
+
+  gestures:
+    type: object
+    description:
+      A list of gestures supported by the CST816S touchscreen controller and
+      their associated Linux input event codes.
+    optional: true
+
+    properties:
+      "^.*$":
+        type: object
+        description:
+          Each child node represents a gesture that the touchscreen controller
+          can recognize.
+
+        properties:
+          cst816x,gesture:
+            description:
+              Numeric value representing the gesture ID recognized by the
+              CST816S touchscreen controller.
+            $ref: /schemas/types.yaml#/definitions/uint32
+
+          linux,code:
+            description:
+              Linux input event code (from linux/input-event-codes.h) that
+              corresponds to the gesture.
+            $ref: /schemas/types.yaml#/definitions/uint32
+
+        required:
+          - cst816x,gesture
+          - linux,code
+
+        additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/input/linux-event-codes.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      touchscreen@15 {
+        compatible = "hynitron,cst816s";
+        reg = <0x15>;
+        interrupt-parent = <&gpio0>;
+        interrupts = <4 IRQ_TYPE_EDGE_RISING>;
+        reset-gpios = <&gpio 17 GPIO_ACTIVE_LOW>;
+
+        gestures {
+          swipe_up {
+            cst816x,gesture = <0x1>;
+            linux,code = <BTN_FORWARD>;
+          };
+
+          swipe_down {
+            cst816x,gesture = <0x2>;
+            linux,code = <BTN_BACK>;
+          };
+
+          swipe_left {
+            cst816x,gesture = <0x3>;
+            linux,code = <BTN_LEFT>;
+          };
+
+          swipe_right {
+            cst816x,gesture = <0x4>;
+            linux,code = <BTN_RIGHT>;
+          };
+
+          single_tap {
+            cst816x,gesture = <0x5>;
+            linux,code = <BTN_TOUCH>;
+          };
+
+          long_press {
+            cst816x,gesture = <0xC>;
+            linux,code = <BTN_TOOL_TRIPLETAP>;
+          };
+        };
+      };
+    };
+
+...
-- 
2.34.1