Hi Tomi,
On 08/25/2015 01:34 PM, Tomi Valkeinen wrote:
Add DT binding for led-backlight.
Signed-off-by: Tomi Valkeinen <[email protected]>
---
.../bindings/video/backlight/led-backlight.txt | 30 ++++++++++++++++++++++
1 file changed, 30 insertions(+)
create mode 100644
Documentation/devicetree/bindings/video/backlight/led-backlight.txt
diff --git
a/Documentation/devicetree/bindings/video/backlight/led-backlight.txt
b/Documentation/devicetree/bindings/video/backlight/led-backlight.txt
new file mode 100644
index 000000000000..fb77051ac230
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/led-backlight.txt
@@ -0,0 +1,30 @@
+led-backlight bindings
+
+Required properties:
+ - compatible: "led-backlight"
+ - leds: phandle to a led OF node [0]
+ - brightness-levels: Array of distinct LED brightness levels. These
+ are in the range from 0 to 255, passed to the LED class driver.
+ - default-brightness-level: the default brightness level (index into the
+ array defined by the "brightness-levels" property)
+ - power-supply: regulator for supply voltage
+
+Optional properties:
+ - enable-gpios: contains a single GPIO specifier for the GPIO which enables
+ and disables the backlight (see GPIO binding[1])
+
+[0]: Documentation/devicetree/bindings/leds/common.txt
+[1]: Documentation/devicetree/bindings/gpio/gpio.txt
+
+Example:
+
+ backlight {
+ compatible = "led-backlight";
+ leds = <&backlight_led>;
+
+ brightness-levels = <0 4 8 16 32 64 128 255>;
brightness level is not a suitable unit for describing LED brightness
in a Device Tree, as it is not a physical unit. We have led-max-microamp
property for this, expressed in microamperes, please refer to [0] from
linux-next.
+ default-brightness-level = <6>;
This also should be microamperes.
+ power-supply = <&vdd_bl_reg>;
+ enable-gpios = <&gpio 58 0>;
+ };
--
Best Regards,
Jacek Anaszewski
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