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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/Documentation/devicetree/bindings/pps/pps-gpio.txt
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@@ -7,6 +7,10 @@
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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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+
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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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@@ -19,5 +23,8 @@
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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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+
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 		compatible = "pps-gpio";
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 	};