Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG

[Rob Herring]

On Thu, Mar 23, 2017 at 09:37:49PM +0100, Pavel Machek wrote:
> Hi!
> 
> > The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
> > PMICs from Qualcomm. It can operate on fixed parameters or based on a
> > lookup-table, altering the duty cycle over time - which provides the
> > means for e.g. hardware assisted transitions of LED brightness.
> 
> Ok, this is not first hardware that supports something like this. We
> have similar hardware that can do blinking on Nokia N900 -- please
> take a look at leds-lp55*.c

And perhaps some alignment on the bindings too if the N900 has bindings.

> And it would be really good to provide hardware abstraction. We really
> don't want to have different userspace for LPG and for N900 and for

I'm interested in what this looks like as several AOSP platforms do 
tri-color LEDs with custom sysfs extensions.

Do any of the Dragonboards have tri-color LEDs?

Rob