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auxdisplay: ht16k33: Add LED support
Instantiate a single LED based on the "led" subnode in DT. This allows the user to control display brightness and blinking (backed by hardware support) through the LED class API and triggers, and exposes the display color. The LED will be named "auxdisplay:<color>:<function>". When running in dot-matrix mode and if no "led" subnode is found, the driver falls back to the traditional backlight mode, to preserve backwards compatibility. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
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