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Commit 652e2218 authored by Tom Burkart's avatar Tom Burkart Committed by Linus Torvalds
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dt-bindings: pps: pps-gpio PPS ECHO implementation 

This patch implements the device tree binding changes required for the
PPS ECHO functionality for pps-gpio, that sysfs claims is available
already.

It adds two DT properties for configuring the PPS ECHO functionality.

This patch is provided separated from the rest of the patch per
Documentation/devicetree/bindings/submitting-patches.txt.

This patch was originally written by Lukas Senger as part of a masters
thesis project and modified for inclusion into the linux kernel by Tom
Burkart.

Link: http://lkml.kernel.org/r/20190324043305.6627-3-tom@aussec.com


Signed-off-by: default avatarTom Burkart <tom@aussec.com>
Signed-off-by: default avatarLukas Senger <lukas@fridolin.com>
Acked-by: default avatarRodolfo Giometti <giometti@enneenne.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Cc: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4461d651

Documentation/devicetree/bindings/pps/pps-gpio.txt

+7 −0
Original line number Diff line number Diff line
@@ -7,6 +7,10 @@ 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)
@@ -19,5 +23,8 @@ Example: 
		gpios = <&gpio1 26 GPIO_ACTIVE_HIGH>;

		assert-falling-edge;



		echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;

		echo-active-ms = <100>;



		compatible = "pps-gpio";

	};