[PATCH v3 4/4] dt-bindings: pwm-backlight: move brightness-levels to optional.

Enric Balletbo i Serra
2018-02-08T11:30:57Z

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>
---
Changes since v2:
- Add Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
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@kernel.org>

.../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