linux-kernel - [PATCH v2 06/12] backlight: Document consumers of backlight nodes

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Message-Id: <1435743667-11987-7-git-send-email-tomeu.vizoso@collabora.com>
Date:	Wed,  1 Jul 2015 11:41:01 +0200
From:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mark Brown <broonie@...nel.org>, linux-acpi@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-pwm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	alsa-devel@...a-project.org,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: [PATCH v2 06/12] backlight: Document consumers of backlight nodes

Add a small note that makes explicit that properties named 'backlight'
contain phandles to backlight nodes.

This is needed so that we can automatically extract dependencies on
backlight devices by assuming that a property with that name contains a
phandle to such a device.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---

Changes in v2:
- Document that consumers of backlight devices can use the 'backlight'
  property to hold a phandle to the backlight device.

 .../bindings/video/backlight/backlight.txt         | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/backlight.txt

diff --git a/Documentation/devicetree/bindings/video/backlight/backlight.txt b/Documentation/devicetree/bindings/video/backlight/backlight.txt
new file mode 100644
index 0000000..309949d
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/backlight.txt
@@ -0,0 +1,22 @@
+Specifying backlight information for devices
+============================================
+
+Backlight user nodes
+--------------------
+
+Nodes such as display panels that refer to backlight devices can do so by simply having a property named 'backlight' that contains a phandle to a backlight node.
+
+Example:
+
+	backlight: backlight {
+		compatible = "gpio-backlight";
+		gpios = <&gpio3 4 GPIO_ACTIVE_HIGH>;
+	};
+
+	[...]
+
+	panel: panel {
+		compatible = "cptt,claa101wb01";
+
+		backlight = <&backlight>;
+	};
-- 
2.4.1

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