On Wed, Feb 07, 2018 at 03:13:37PM +0100, Enric Balletbo i Serra wrote: > 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: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> > Reviewed-by: Rob Herring <robh@xxxxxxxxxx> Acked-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx> > --- > Changes since v1: > - Fix a couple of typos as requested by Rob. > - s/availablel/available/ > - s/move move/move/ > - "so move..." should be a new sentence. > - Add Reviewed-by: Rob Herring <robh@xxxxxxxxxx> > > .../devicetree/bindings/leds/backlight/pwm-backlight.txt | 15 ++++++++------- > 1 file changed, 8 insertions(+), 7 deletions(-) > > diff --git a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > index ce9b5746b774..64fa2fbd98c9 100644 > --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > @@ -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 > -- > 2.15.1 >
