[PATCH v8 1/2] dt-bindings: input: touchscreen: add hynitron cst816x

[Oleh Kuzhylnyi <kuzhylol@gmail.com>]

Add documentation for Hynitron CST816x series touchscreen bindings.

Signed-off-by: Oleh Kuzhylnyi <kuzhylol@gmail.com>
---
Changes in v8:
 - Use linux,keycodes to map touch gestures to key events
 - Refactore binding properties based on feedback from Jeff LaBundy
   and Krzysztof Kozlowski to align with official documentation

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,cst816x.yaml   | 82 +++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816x.yaml

diff --git a/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816x.yaml b/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816x.yaml
new file mode 100644
index 000000000000..0d358463d7f8
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/hynitron,cst816x.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/hynitron,cst816x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hynitron CST816x Series Capacitive Touch controller
+
+maintainers:
+  - Oleh Kuzhylnyi <kuzhylol@gmail.com>
+
+description: |
+  Bindings for CST816x high performance self-capacitance touch chip series
+  with single point gesture and real two-point operation.
+
+properties:
+  compatible:
+    enum:
+      - hynitron,cst816s
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  linux,keycodes:
+    minItems: 1
+    maxItems: 16
+    description: |
+      Specifies the numeric keycodes associated with each available gesture in
+      the following order (enter 0 for unused and reserved gestures):
+      0: Touch
+      1: Swipe up
+      2: Swipe down
+      3: Swipe left
+      4: Swipe right
+      5-11: Reserved
+      12: Long press
+      13-15: Reserved
+
+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>;
+              linux,keycodes = <BTN_TOUCH>,
+                               <KEY_UP>,
+                               <KEY_DOWN>,
+                               <KEY_LEFT>,
+                               <KEY_RIGHT>,
+                               <KEY_RESERVED>,
+                               <KEY_RESERVED>,
+                               <KEY_RESERVED>,
+                               <KEY_RESERVED>,
+                               <KEY_RESERVED>,
+                               <KEY_RESERVED>,
+                               <KEY_RESERVED>,
+                               <BTN_TOOL_TRIPLETAP>;
+          };
+    };
+
+...
-- 
2.34.1