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| author |   Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2018-04-09 10:33:33 +0200 |
|---|---|---|
| committer |   Lee Jones <lee.jones@linaro.org> | 2018-07-04 10:31:18 +0100 |
| commit | c8cc0f0460bb53e1a731097c7cdfdb4973c7cfcf (patch) | |
| tree | d458f9ba24a7c186eaa3c58395ffaa6a4c4194c8 /Documentation/devicetree/bindings/leds | |
| parent | backlight: pwm_bl: Compute brightness of LED linearly to human eye (diff) | |
| download | linux-dev-c8cc0f0460bb53e1a731097c7cdfdb4973c7cfcf.tar.xz linux-dev-c8cc0f0460bb53e1a731097c7cdfdb4973c7cfcf.zip | |
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: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/leds')
| -rw-r--r-- | Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt | 15 |
1 files 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 |