31 lines
860 B
Plaintext
31 lines
860 B
Plaintext
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Device-Tree Bindings for a PPS Signal on GPIO
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These properties describe a PPS (pulse-per-second) signal connected to
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a GPIO pin.
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Required properties:
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- compatible: should be "pps-gpio"
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- gpios: one PPS GPIO in the format described by ../gpio/gpio.txt
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Additional required properties for the PPS ECHO functionality:
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- echo-gpios: one PPS ECHO GPIO in the format described by ../gpio/gpio.txt
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- echo-active-ms: duration in ms of the active portion of the echo pulse
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Optional properties:
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- assert-falling-edge: when present, assert is indicated by a falling edge
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(instead of by a rising edge)
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Example:
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pps {
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_pps>;
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gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;
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assert-falling-edge;
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echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
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echo-active-ms = <100>;
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compatible = "pps-gpio";
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};
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