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Commit c8cc0f04 authored by Enric Balletbo i Serra's avatar Enric Balletbo i Serra Committed by Lee Jones
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dt-bindings: pwm-backlight: Move brightness-levels to optional 



The patch 'backlight: pwm_bl: compute brightness of LED linearly to
human eye' introduced a default brightness-levels table that is used
when brightness-levels is not available in the dts. So move
brightness-levels and default-brightness-level to be optional.

Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Acked-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 88ba95be

Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt

+8 −7
Original line number Diff line number Diff line
@@ -3,13 +3,6 @@ pwm-backlight bindings 
Required properties:

  - compatible: "pwm-backlight"

  - pwms: OF device-tree PWM specification (see PWM binding[0])

  - brightness-levels: Array of distinct brightness levels. Typically these

      are in the range from 0 to 255, but any range starting at 0 will do.

      The actual brightness level (PWM duty cycle) will be interpolated

      from these values. 0 means a 0% duty cycle (darkest/off), while the

      last value in the array represents a 100% duty cycle (brightest).

  - 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:
@@ -21,6 +14,14 @@ Optional properties: 
                          and enabling the backlight using GPIO.

  - pwm-off-delay-ms: Delay in ms between disabling the backlight using GPIO

                      and setting PWM value to 0.

  - brightness-levels: Array of distinct brightness levels. Typically these

                       are in the range from 0 to 255, but any range starting at

                       0 will do. The actual brightness level (PWM duty cycle)

                       will be interpolated from these values. 0 means a 0% duty

                       cycle (darkest/off), while the last value in the array

                       represents a 100% duty cycle (brightest).

  - default-brightness-level: The default brightness level (index into the

                              array defined by the "brightness-levels" property).

  - num-interpolated-steps: Number of interpolated steps between each value

                            of brightness-levels table. This way a high

                            resolution pwm duty cycle can be used without