[PATCH] dt-bindings: serial: nxp,sc16is7xx: Add missing child node

[Animesh Agarwal <animeshagarwal28@gmail.com>]

Add missing child node property clock-sc16is7xx to nxp,sc16is7xx.yaml. This
fixes the following warning upon running make dtbs_check:

./arch/arm64/boot/dts/freescale/fsl-ls1012a-frdm.dtb: serial@0:
Unevaluated properties are not allowed ('clock-sc16is7xx' was unexpected)
from schema $id: http://devicetree.org/schemas/serial/nxp,sc16is7xx.yaml#

Signed-off-by: Animesh Agarwal <animeshagarwal28@gmail.com>
Cc: Daniel Baluta <daniel.baluta@nxp.com>
---
 .../bindings/serial/nxp,sc16is7xx.yaml        | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml
index 5dec15b7e7c3..d572b7e76c39 100644
--- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml
+++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml
@@ -70,6 +70,25 @@ properties:
       minimum: 0
       maximum: 1
 
+  clock-sc16is7xx:
+    type: object
+
+    additionalProperties: false
+
+    properties:
+      compatible:
+        const: fixed-clock
+
+      "#clock-cells":
+        const: 0
+
+      clock-frequency: true
+
+    required:
+      - compatible
+      - "#clock-cells"
+      - clock-frequency
+
 required:
   - compatible
   - reg
-- 
2.45.2