linux-kernel - [PATCH 1/3] Device tree binding documentation for gpio-switch

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Message-Id: <1449250275-23435-2-git-send-email-martyn.welch@collabora.co.uk>
Date:	Fri,  4 Dec 2015 17:31:13 +0000
From:	Martyn Welch <martyn.welch@...labora.co.uk>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Martyn Welch <martyn.welch@...labora.co.uk>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, Olof Johansson <olof@...om.net>
Subject: [PATCH 1/3] Device tree binding documentation for gpio-switch

This patch adds documentation for the gpio-switch binding. This binding
provides a mechanism to bind named links to gpio, with the primary
purpose of enabling standardised access to switches that might be standard
across a group of devices but implemented differently on each device.

Signed-off-by: Martyn Welch <martyn.welch@...labora.co.uk>
---
 .../devicetree/bindings/misc/gpio-switch.txt       | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/gpio-switch.txt

diff --git a/Documentation/devicetree/bindings/misc/gpio-switch.txt b/Documentation/devicetree/bindings/misc/gpio-switch.txt
new file mode 100644
index 0000000..13528bd
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/gpio-switch.txt
@@ -0,0 +1,47 @@
+Device-Tree bindings for gpio attached switches.
+
+This provides a mechanism to provide a named link to specified gpios. This can
+be useful in instances such as when theres a need to monitor a switch, which is
+common across a family of devices, but attached to different gpios and even
+implemented in different ways on differnet devices.
+
+Required properties:
+	- compatible = "gpio-switch";
+
+Each signal is represented as a sub-node of "gpio-switch". The naming of
+sub-nodes is arbitrary.
+
+Required sub-node properties:
+
+	- label: Name to be given to gpio switch.
+	- gpios: OF device-tree gpio specification.
+
+Optional sub-node properties:
+
+	- read-only: Boolean flag to mark the gpio as read-only, i.e. the line
+	  should not be driven by the host.
+
+Example nodes:
+
+        gpio-switch {
+                compatible = "gpio-switch";
+
+                write-protect {
+                        label = "write-protect";
+                        gpios = <&gpx3 0 GPIO_ACTIVE_LOW>;
+                        read-only;
+                };
+
+                developer-switch {
+                        label = "developer-switch";
+                        gpios = <&gpx1 3 GPIO_ACTIVE_HIGH>;
+                        read-only;
+                };
+
+                recovery-switch {
+                        label = "recovery-switch";
+                        gpios = <&gpx0 7 GPIO_ACTIVE_LOW>;
+                        read-only;
+                };
+        };
+
-- 
2.1.4

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