The patch titled
Subject: pwm_backlight-add-device-tree-support-for-low-threshold-brightness-fix
has been added to the -mm tree. Its filename is
pwm_backlight-add-device-tree-support-for-low-threshold-brightness-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: pwm_backlight-add-device-tree-support-for-low-threshold-brightness-fix
Cc: "Philip, Avinash" <avinashphilip@xxxxxx>
Cc: Florian Tobias Schandinat <FlorianSchandinat@xxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: Philip, Avinash <avinashphilip@xxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Cc: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt | 18 +++++-----
1 file changed, 9 insertions(+), 9 deletions(-)
diff -puN Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt~pwm_backlight-add-device-tree-support-for-low-threshold-brightness-fix Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
--- a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt~pwm_backlight-add-device-tree-support-for-low-threshold-brightness-fix
+++ a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
@@ -14,15 +14,15 @@ Required properties:
Optional properties:
- pwm-names: a list of names for the PWM devices specified in the
"pwms" property (see PWM binding[0])
- - low-threshold-brightness: brightness threshold low level. Low threshold
- brightness set to value so that backlight present on low end of
- brightness.
- Some panels, backlight would absent if duty percentage of PWM wave is less
- than certain level (say 20%). By setting low-threshold-brightness to a
- value above (percentage of brightness-levels max) 50 (20% of 255, if 255
- is max). On setting low-threshold-brightness, range of brightness-levels
- is calculated in a region of low-threshold-brightness to brightness-levels
- max.
+ - low-threshold-brightness: brightness threshold low level. Sets the lowest
+ brightness value.
+ On some panels the backlight misbehaves if the duty cycle percentage of the
+ PWM wave is less than a certain level (say 20%). In this example the user
+ can set low-threshold-brightness to a value above 50 (ie, 20% of 255), thus
+ preventing the PWM duty cycle from going too low.
+ On setting low-threshold-brightness the range of brightness levels is
+ calculated in the range low-threshold-brightness to the maximum value in
+ brightness-levels, described above.
[0]: Documentation/devicetree/bindings/pwm/pwm.txt
_
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