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 3/4] dt-bindings: pps: pps-gpio PPS ECHO implementation
Date: Wed, 14 Nov 2018 23:54:31 +1100 [thread overview]
Message-ID: <20181114125432.16044-4-tom@aussec.com> (raw)
In-Reply-To: <20181114125432.16044-3-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 | 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
next prev parent reply other threads:[~2018-11-14 12:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-14 12:54 [PATCH v7 0/4] PPS: pps-gpio PPS ECHO implementation Tom Burkart
2018-11-14 12:54 ` [PATCH v7 1/4] dt-bindings: pps: descriptor-based gpio, capture-clear addition Tom Burkart
2018-11-14 12:54 ` [PATCH v7 2/4] " Tom Burkart
2018-11-14 12:54 ` Tom Burkart [this message]
2018-11-14 12:54 ` [PATCH v7 4/4] pps: pps-gpio pps-echo implementation Tom Burkart
2018-11-16 22:49 ` [PATCH v7 1/4] dt-bindings: pps: descriptor-based gpio, capture-clear addition Rob Herring
2018-11-17 10:35 ` tom burkart
2018-11-17 14:22 ` Rob Herring
2018-11-18 0:35 ` tom burkart
2018-11-26 19:39 ` Rob Herring
2018-11-27 3:57 ` tom burkart
2018-11-28 17:13 ` Rob Herring
2018-11-29 0:29 ` tom burkart
2018-11-29 2:05 ` tom burkart
2018-11-29 18:00 ` Rob Herring
2018-12-01 22:24 ` tom burkart
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