dt-bindings: Add devicetree bindings to devicetree project

Add devicetree bindings snapshot to the devicetree project.
This snapshot is taken as of
'commit f3dd4aaeb34438c877ccd42f5a48ccd554dd765a (Merge
"platform: qpnp-revid: Add REVID support for PM7250B")' of
the kernel project.

Change-Id: I5e0ec0eae63ff9c071b2924bd84c5b20d3f6554d

1 files changed, 23 insertions, 0 deletions

diff --git a/bindings/pps/pps-gpio.txt b/bindings/pps/pps-gpio.txt
new file mode 100644
index 00000000..36838748
--- /dev/null
+++ b/bindings/pps/pps-gpio.txt
@@ -0,0 +1,23 @@
+Device-Tree Bindings for a PPS Signal on GPIO
+
+These properties describe a PPS (pulse-per-second) signal connected to
+a GPIO pin.
+
+Required properties:
+- compatible: should be "pps-gpio"
+- gpios: one PPS GPIO in the format described by ../gpio/gpio.txt
+
+Optional properties:
+- assert-falling-edge: when present, assert is indicated by a falling edge
+                       (instead of by a rising edge)
+
+Example:
+	pps {
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pps>;
+
+		gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
+		assert-falling-edge;
+
+		compatible = "pps-gpio";
+	};