1e4fc727f3b180f84242a3d77b3854ad113b4a60
[linux-3.10.git] / Documentation / devicetree / bindings / video / backlight / pwm-backlight.txt
1 pwm-backlight bindings
2
3 Required properties:
4   - compatible: "pwm-backlight"
5   - pwms: OF device-tree PWM specification (see PWM binding[0])
6   - brightness-levels: Array of distinct brightness levels. Typically these
7       are in the range from 0 to 255, but any range starting at 0 will do.
8       The actual brightness level (PWM duty cycle) will be interpolated
9       from these values. 0 means a 0% duty cycle (darkest/off), while the
10       last value in the array represents a 100% duty cycle (brightest).
11   - default-brightness-level: the default brightness level (index into the
12       array defined by the "brightness-levels" property)
13
14 Optional properties:
15   - pwm-names: a list of names for the PWM devices specified in the
16                "pwms" property (see PWM binding[0])
17
18 [0]: Documentation/devicetree/bindings/pwm/pwm.txt
19
20 Example:
21
22         backlight {
23                 compatible = "pwm-backlight";
24                 pwms = <&pwm 0 5000000>;
25
26                 brightness-levels = <0 4 8 16 32 64 128 255>;
27                 default-brightness-level = <6>;
28         };