summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/pps
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /Documentation/devicetree/bindings/pps
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'Documentation/devicetree/bindings/pps')
-rw-r--r--Documentation/devicetree/bindings/pps/pps-gpio.txt30
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pps/pps-gpio.txt b/Documentation/devicetree/bindings/pps/pps-gpio.txt
new file mode 100644
index 000000000..9012a2a02
--- /dev/null
+++ b/Documentation/devicetree/bindings/pps/pps-gpio.txt
@@ -0,0 +1,30 @@
+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
+
+Additional required properties for the PPS ECHO functionality:
+- echo-gpios: one PPS ECHO GPIO in the format described by ../gpio/gpio.txt
+- echo-active-ms: duration in ms of the active portion of the echo pulse
+
+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;
+
+ echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
+ echo-active-ms = <100>;
+
+ compatible = "pps-gpio";
+ };