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@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>; + };