dt-bindings: gnss: add mediatek binding

Add binding for Mediatek-based GNSS receivers.

Signed-off-by: Loys Ollivier <lollivier@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
[ johan: rename backup supply ]
Signed-off-by: Johan Hovold <johan@kernel.org>

diff --git a/Documentation/devicetree/bindings/gnss/mediatek.txt b/Documentation/devicetree/bindings/gnss/mediatek.txt
new file mode 100644 (file)
index 0000000..80cb802
--- /dev/null
+++ b/Documentation/devicetree/bindings/gnss/mediatek.txt
@@ -0,0 +1,35 @@
+Mediatek-based GNSS Receiver DT binding
+
+Mediatek chipsets are used in GNSS-receiver modules produced by several
+vendors and can use a UART interface.
+
+Please see Documentation/devicetree/bindings/gnss/gnss.txt for generic
+properties.
+
+Required properties:
+
+- compatible   : Must be
+
+                       "globaltop,pa6h"
+
+- vcc-supply   : Main voltage regulator (pin name: VCC)
+
+Optional properties:
+
+- current-speed                : Default UART baud rate
+- gnss-fix-gpios       : GPIO used to determine device position fix state
+                         (pin name: FIX, 3D_FIX)
+- reset-gpios          : GPIO used to reset the device (pin name: RESET, NRESET)
+- timepulse-gpios      : Time pulse GPIO (pin name: PPS1, 1PPS)
+- vbackup-supply       : Backup voltage regulator (pin name: VBAT, VBACKUP)
+
+Example:
+
+serial@1234 {
+       compatible = "ns16550a";
+
+       gnss {
+               compatible = "globaltop,pa6h";
+               vcc-supply = <&vcc_3v3>;
+       };
+};