We have multicolor, but should we turn it into RGB?

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Hi!

Multicolor is a bit too abstract. Yes, we can have
Green-Magenta-Ultraviolet LED, but so far all the LEDs we support are
RGB, and not even RGB-White or RGB-Yellow variants emerged.

Multicolor is not a good fit for RGB LED. It does not really know
about LED color.  In particular, there's no way to make LED "white".

Userspace is interested in knowing "this LED can produce arbitrary
color", which not all multicolor LEDs can.

	Proposal: let's add "rgb" to led_colors in
	drivers/leds/led-core.c, add corresponding device tree
	defines, and use that, instead of multicolor for RGB LEDs.

	We really need to do that now; "white" stuff can wait.

RGB LEDs are quite common, and it would be good to be able to turn LED
white and to turn it into any arbitrary color. It is essential that
userspace is able to set arbitrary colors, and it might be good to
have that ability from kernel, too... to allow full-color triggers.

Best regads,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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