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 at collabora.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
