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- Core Frameworks

Browse source 
- Remove unused/obsolete code/comments
 
  - New Functionality
    - Allow less granular brightness specification for high-res PWMs; pwm_bl
    - Align brightness {inc,dec}rements with that perceived by the human-eye; pwm_bl
 
  - Fix-ups
    - Prepare for the introduction of -Wimplicit-fall-through; adp8860_bl
 
  - Bug Fixes
    - Fix uninitialised variable; pwm_bl
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Merge tag 'backlight-next-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight

Pull backlight updates from Lee Jones:
 "Core Framework:
   - Remove unused/obsolete code/comments

  New Functionality:
   - Allow less granular brightness specification for high-res PWMs; pwm_bl
   - Align brightness {inc,dec}rements with that perceived by the human-eye; pwm_bl

  Fix-ups:
   - Prepare for the introduction of -Wimplicit-fall-through; adp8860_bl

  Bug Fixes:
   - Fix uninitialised variable; pwm_bl"

* tag 'backlight-next-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
  backlight: pwm_bl: Fix uninitialized variable
  backlight: adp8860: Mark expected switch fall-through
  backlight: Remove obsolete comment for ->state
  dt-bindings: pwm-backlight: Move brightness-levels to optional
  backlight: pwm_bl: Compute brightness of LED linearly to human eye
  dt-bindings: pwm-backlight: Add a num-interpolation-steps property
  backlight: pwm_bl: Linear interpolation between brightness-levels
This commit is contained in:
Linus Torvalds 2018-08-20 15:41:37 -07:00
commit 61c4fc1eaf
4 changed files with 247 additions and 21 deletions
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34
Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt
View file

@ -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 +14,19 @@ 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
having to list out every possible value in the
brightness-level array.
[0]: Documentation/devicetree/bindings/pwm/pwm.txt
[1]: Documentation/devicetree/bindings/gpio/gpio.txt
@ -39,3 +45,17 @@ Example:
post-pwm-on-delay-ms = <10>;
pwm-off-delay-ms = <10>;
};
Example using num-interpolation-steps:
backlight {
compatible = "pwm-backlight";
pwms = <&pwm 0 5000000>;
brightness-levels = <0 2048 4096 8192 16384 65535>;
num-interpolated-steps = <2048>;
default-brightness-level = <4096>;
power-supply = <&vdd_bl_reg>;
enable-gpios = <&gpio 58 0>;
};