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

From	Rob Herring <robh@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG
Date	2017-03-29 04:20 +0200
Message-ID	<tqbnk-bP-19@gated-at.bofh.it> (permalink)
References	<to5vK-7s8-47@gated-at.bofh.it> <tohGy-7w7-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Rob Herring <robh@kernel.org> - 2017-03-29 04:20 +0200
  Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Bjorn Andersson <bjorn.andersson@linaro.org> - 2017-03-29 21:10 +0200
    Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-03-30 00:30 +0200
      Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Bjorn Andersson <bjorn.andersson@linaro.org> - 2017-03-30 02:20 +0200
        Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-03-30 09:50 +0200
          Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2017-03-31 11:30 +0200
            Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2017-04-02 15:00 +0200
              Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Bjorn Andersson <bjorn.andersson@linaro.org> - 2017-04-03 20:30 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2017-04-03 22:40 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-04-10 12:00 +0200
            Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Bjorn Andersson <bjorn.andersson@linaro.org> - 2017-04-03 21:10 +0200
              Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2017-04-03 22:40 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Bjorn Andersson <bjorn.andersson@linaro.org> - 2017-04-07 22:30 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-04-08 12:00 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-04-08 15:40 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Jacek Anaszewski <jacek.anaszewski@gmail.com> - 2017-04-09 14:40 +0200
              Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-04-07 15:40 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Bjorn Andersson <bjorn.andersson@linaro.org> - 2017-04-07 22:40 +0200
                Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-04-08 11:40 +0200
            Re: [PATCH 1/2] leds: Add driver for Qualcomm LPG Pavel Machek <pavel@ucw.cz> - 2017-04-07 15:00 +0200

csiph-web