[PATCH 3/6] dt-bindings: serdev: ngsm: Add binding for GNSS child node

[Tony Lindgren <tony@xxxxxxxxxxx>]

For motorola modem case, we may have a GNSS device on channel 4.
Let's add that to the binding and example.

Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
 .../devicetree/bindings/serdev/serdev-ngsm.yaml          | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml b/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml
--- a/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml
+++ b/Documentation/devicetree/bindings/serdev/serdev-ngsm.yaml
@@ -42,6 +42,10 @@ allOf:
           description: Name of the USB PHY
           const: usb
 
+        compatible:
+          description: GNSS receiver
+          const: motorola,mapphone-mdm6600-gnss
+
       required:
         - phys
         - phy-names
@@ -61,4 +65,9 @@ examples:
       phy-names = "usb";
       #address-cells = <1>;
       #size-cells = <0>;
+
+      gnss@4 {
+         compatible = "motorola,mapphone-mdm6600-gnss";
+         reg = <4>;
+      };
     };
-- 
2.26.2