[PATCH 1/2] dt-bindings: input: goodix,gt9916: Document stylus support

[Pengyu Luo <mitltlatltl@gmail.com>]

Document stylus support. Optional support for DT properties:
  - `goodix,stylus-enable`
  - `goodix,stylus-pressure-level`
  - `goodix,physical-x`
  - `goodix,physical-y`

Signed-off-by: Pengyu Luo <mitltlatltl@gmail.com>
---
 .../input/touchscreen/goodix,gt9916.yaml      | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml b/Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml
index c40d92b7f..e5476ea36 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml
@@ -44,6 +44,27 @@ properties:
   touchscreen-size-y: true
   touchscreen-swapped-x-y: true
 
+  goodix,stylus-enable:
+    type: boolean
+    description:
+      Indicates that stylus (pen) functionality is enabled. If present,
+      the driver will initialize stylus-specific input reporting.
+
+  goodix,physical-x:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Physical width of the touchscreen in millimeters.
+
+  goodix,physical-y:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Physical height of the touchscreen in millimeters.
+
+  goodix,stylus-pressure-level:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Number of discrete pressure levels supported by the stylus.
+      The reported ABS_PRESSURE range will be 0 to
+      (goodix,stylus-pressure-level - 1).
+
 additionalProperties: false
 
 required:
-- 
2.49.0