linux-kernel - [PATCH 3/4] dt-bindings: pps: pps-gpio PPS ECHO implementation

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Message-Id: <20181114125432.16044-4-tom@aussec.com>
Date:   Wed, 14 Nov 2018 23:54:31 +1100
From:   Tom Burkart <tom@...sec.com>
To:     Linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:     Tom Burkart <tom@...sec.com>, devicetree@...r.kernel.org,
        Lukas Senger <lukas@...dolin.com>
Subject: [PATCH 3/4] dt-bindings: pps: pps-gpio PPS ECHO implementation

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

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.

Signed-off-by: Lukas Senger <lukas@...dolin.com>
Signed-off-by: Tom Burkart <tom@...sec.com>
---
 Documentation/devicetree/bindings/pps/pps-gpio.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/pps/pps-gpio.txt b/Documentation/devicetree/bindings/pps/pps-gpio.txt
index 6c9fc0998d94..f85dbe4ce0b3 100644
--- a/Documentation/devicetree/bindings/pps/pps-gpio.txt
+++ b/Documentation/devicetree/bindings/pps/pps-gpio.txt
@@ -9,10 +9,15 @@ Required properties:
 Alternatively (DEPRECATED), instead of pps-gpios above, it may have:
 - gpios: one PPS GPIO as above
 
+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)
 - capture-clear: when present, also capture the PPS clear event
+- invert-pps-echo: when present, invert the PPS ECHO pulse
 
 Example:
 	pps {
@@ -23,5 +28,9 @@ Example:
 		assert-falling-edge;
 		capture-clear;
 
+		echo-gpios = <&gpio1 27 GPIO_ACTIVE_HIGH>;
+		echo-active-ms = <100>;
+		invert-pps-echo;
+
 		compatible = "pps-gpio";
 	};
-- 
2.12.3