add bindings documentation for Wi2Wi W2SG00x4 GPS module.

Signed-off-by: H. Nikolaus Schaller <h...@goldelico.com>
Acked-by: Rob Herring <r...@kernel.org>
---
 .../devicetree/bindings/gps/wi2wi,w2sg0004.txt     | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gps/wi2wi,w2sg0004.txt

diff --git a/Documentation/devicetree/bindings/gps/wi2wi,w2sg0004.txt 
b/Documentation/devicetree/bindings/gps/wi2wi,w2sg0004.txt
new file mode 100644
index 000000000000..bcf307382afb
--- /dev/null
+++ b/Documentation/devicetree/bindings/gps/wi2wi,w2sg0004.txt
@@ -0,0 +1,24 @@
+Wi2Wi GPS module connected through UART
+
+Should be a subnode of the SoC UART it is connected to.
+
+Required properties:
+- compatible:  should be one of (depending on precise model)
+       "wi2wi,w2sg0004"
+       "wi2wi,w2sg0084"
+- enable-gpio: the GPIO that controls the module's power toggle
+       input. A positive impulse of sufficent length toggles the
+       power state.
+
+Optional properties:
+- lna-supply:  an (optional) LNA regulator that is enabled together with the 
GPS receiver
+
+Example:
+
+&uart2 {
+       w2sg0004: gps {
+               compatible = "wi2wi,w2sg0004";
+               lna-supply = <&vsim>;   /* LNA regulator */
+               enable-gpios = <&gpio5 17 GPIO_ACTIVE_HIGH>;    /* GPIO_145: 
trigger for turning on/off w2sg0004 */
+        };
+};
-- 
2.12.2

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