[PATCH v2 5/6] dt-bindings: input: zinitix: Document touch-keys support

[Nikita Travkin]

In some configurations the touch controller can support the touch-keys.
Document the linux,keycodes property that enables those keys and
specifies the keycodes that should be used to report the key events.

Signed-off-by: Nikita Travkin <nikita@xxxxxxx>
---
Changes in v2:
 - Include input.yaml schema at the top level instead of at the
   property. (Seems like I still can't think of the schema as device
   and not implementation-specific thing...)
 - Reword the description to be more informative.
---
 .../bindings/input/touchscreen/zinitix,bt400.yaml      | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml b/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml
index b4e5ba7c0b49..67ed853289b2 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/zinitix,bt400.yaml
@@ -16,6 +16,7 @@ maintainers:
 
 allOf:
   - $ref: touchscreen.yaml#
+  - $ref: ../input.yaml#
 
 properties:
   $nodename:
@@ -79,6 +80,15 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [1, 2]
 
+  linux,keycodes:
+    description: |
+      This property specifies an array of keycodes assigned to the
+      touch-keys that can be present in some touchscreen configurations.
+      If the touch-keys are enabled, controller firmware will assign some
+      touch sense lines to those keys.
+    minItems: 1
+    maxItems: 8
+
   touchscreen-size-x: true
   touchscreen-size-y: true
   touchscreen-fuzz-x: true
-- 
2.30.2