On Wed, Jul 18, 2012 at 02:59:32PM +0000, Philip, Avinash wrote: > Hi, > > In pwm-backlight driver low threshold brightness support in DT is not > present. Do you have any plans in such direction? > > I am planning to add support for the same but want to avoid duplication > of work. > > Below scenario describes need for it: > On some boards panel backlight is OFF at low end of brightness scale. > So with Low threshold brightness we can have linear scale in brightness > (Though the actual brightness scale is changes to Low threshold > brightness value instead of 0). > > Example with Low threshold brightness > pwms = <&pwm 0 50000>; > brightness-levels = <0 2 4 8 16 32 64 128 255>; > default-brightness-level = <6>; > brightness_threshold_level = <50>; > > It can also be achieved without Low threshold brightness as below > > pwms = <&pwm 0 50000>; > brightness-levels = <0 51 53 56 62 75 101 152 255>; > default-brightness-level = <6>; > > But brightness-levels won't be uniformly divided. > > So it is good to have low threshold DT support for backlight. > > Thanks > Avinash Philip
I have no plans to add it myself, but feel free to send a patch. There is a corresponding field in the platform data already, so adding DT support is probably a good idea. Thierry
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