On Wed 2021-02-03 15:39:59, Sven Schuchmann wrote:
> Hello Pavel,
>
> > > In order to use a multicolor-led together with a trigger
> > > from DT the led needs to have an intensity set to see something.
> > > The trigger changes the brightness of the led but if there
> > > is no intensity we actually see nothing.
> > >
> > > This patch adds the ability to set the default intensity
> > > of each led so that it is turned on from DT.
> >
> > Do we need this to be configurable from device tree? Can we just set
> > it to max or something?
> >
> > Aha, this basically sets the initial color for LEDs the monochromatic
> > triggers, right?
>
> Let me try to explain in other words: I have one RGB-LED
> which consists of 3 Colors. Each of the three colors (Red, Green, Blue) you have
> to define in the DT. For example this is my setup for one RGB-LED which I wanted
> to show the heartbeat in Red (half intensity):
>
> multi-led@3 {
> #address-cells = <1>;
> #size-cells = <0>;
> reg = <0x3>;
> color = <LED_COLOR_ID_RGB>;
>
> linux,default-trigger = "heartbeat";
> function = LED_FUNCTION_HEARTBEAT;
>
> led-9 {
> color = <LED_COLOR_ID_RED>;
> default-intensity = <100>;
> };
>
> led-10 {
> color = <LED_COLOR_ID_GREEN>;
> };
>
> led-11 {
> color = <LED_COLOR_ID_BLUE>;
> };
> };
>
> If I would not have the default-intensity I would actually see nothing,
> since the intensity (which goes from 0-255) of each led is initialized with 0.
>
> I hope I could clarify this a little more?
Yes, sounds reasonable. Could we get default intensity of 100% on all
channels if nothing else is specified?
Or maybe simply "if intensity is not specified, start with 100%, and
use explicit =0 if other color is expected".
Best regards,
Pavel
--
http://www.livejournal.com/~pavelmachek
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