Re: "advanced" LED controllers

[Pavel Machek]

On Wed 2015-02-25 18:06:07, Alexandre Courbot wrote:
> On Wed, Feb 25, 2015 at 5:25 PM, Geert Uytterhoeven
> <geert@xxxxxxxxxxxxxx> wrote:
> > CC linux-gpio, as this looks like the LED equivalent of bulk gpio?
> 
> Indeed. The LED core could implement something similar to
> gpiod_set_array() to allow several LEDs to be set in one call. If the
> controller supports it, it would then set all the LEDs at once,
> otherwise the core would apply the values serially.
> 
> In leds-gpio.c, this multiple LED setting could be implemented by a
> single call to gpiod_set_array() and the right thing would happen.

Actually, there are two issues: some controlles can set all LEDs at
once, and some can program pwm level smoothly using given program (and
handle multiple leds in the process).

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/