The property is implemented in the driver but not described in dt-bindings.
Add missing property 'gpio-activelow' to DT schema.

Signed-off-by: Markus Burri <markus.burri@mt.com>

---
 .../devicetree/bindings/input/gpio-matrix-keypad.yaml       | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/gpio-matrix-keypad.yaml b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.yaml
index 0f348b9..0555c1e 100644
--- a/Documentation/devicetree/bindings/input/gpio-matrix-keypad.yaml
+++ b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.yaml
@@ -40,6 +40,12 @@ properties:
     type: boolean
     description: Do not enable autorepeat feature.
 
+  gpio-activelow:
+    type: boolean
+    deprecated: true
+    description:
+      The GPIOs are low active (deprecated).
+      Use the GPIO-flags in gpio controller instead of this property.
 
   debounce-delay-ms:
     description: Debounce interval in milliseconds.
-- 
2.39.5