From: Tom Burkart <tom@aussec.com>
To: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Cc: Tom Burkart <tom@aussec.com>,
devicetree@vger.kernel.org, Lukas Senger <lukas@fridolin.com>
Subject: [PATCH v12 2/3] dt-bindings: pps: pps-gpio PPS ECHO implementation
Date: Wed, 12 Dec 2018 13:52:13 +1100 [thread overview]
Message-ID: <20181212025214.29911-3-tom@aussec.com> (raw)
In-Reply-To: <20181212025214.29911-2-tom@aussec.com>
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@fridolin.com>
Signed-off-by: Tom Burkart <tom@aussec.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
next prev parent reply other threads:[~2018-12-12 2:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 2:52 [PATCH v12 0/3] PPS: pps-gpio PPS ECHO implementation Tom Burkart
2018-12-12 2:52 ` [PATCH v12 1/3] pps: descriptor-based gpio Tom Burkart
2018-12-12 2:52 ` Tom Burkart [this message]
2018-12-12 2:52 ` [PATCH v12 3/3] pps: pps-gpio pps-echo implementation Tom Burkart
2018-12-12 14:01 ` [PATCH v12 2/3] dt-bindings: pps: pps-gpio PPS ECHO implementation Rob Herring
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