linux-kernel - [PATCH v17 2/3] dt-bindings: pps: pps-gpio PPS ECHO implementation

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Date:   Fri, 22 Mar 2019 13:42:32 +1100
From:   Tom Burkart <tom@...sec.com>
To:     Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Tom Burkart <tom@...sec.com>,
        Rodolfo Giometti <giometti@...eenne.com>,
        Lukas Senger <lukas@...dolin.com>
Subject: [PATCH v17 2/3] 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.

Acked-by: Rodolfo Giometti <giometti@...eenne.com>
Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Lukas Senger <lukas@...dolin.com>
Signed-off-by: Tom Burkart <tom@...sec.com>
---
 Documentation/devicetree/bindings/pps/pps-gpio.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/pps/pps-gpio.txt b/Documentation/devicetree/bindings/pps/pps-gpio.txt
index 3683874832ae..9012a2a02e14 100644
--- a/Documentation/devicetree/bindings/pps/pps-gpio.txt
+++ b/Documentation/devicetree/bindings/pps/pps-gpio.txt
@@ -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";
 	};
-- 
2.12.3