linux-kernel - Re: [PATCH 0/3] led: ledtrig-transient: add support for hrtimer

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Message-ID: <CAPzFB+U25eX9H9DTxxPj9FH4r3OrmS8mWgK2Ye-OdAXkf=4p7Q@mail.gmail.com>
Date:   Wed, 3 May 2017 17:28:46 -0700
From:   David Lin <dtwlin@...gle.com>
To:     Jonathan Corbet <corbet@....net>, rpurdie@...ys.net,
        Jacek Anaszewski <jacek.anaszewski@...il.com>, pavel@....cz,
        hdegoede@...hat.com, mark.rutland@....com,
        Tony Makkiel <tony.makkiel@...ri.com>,
        Stephan Linz <linz@...pro.net>
Cc:     robh@...nel.org, Rom Lemarchand <romlem@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        David Lin <dtwlin@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 0/3] led: ledtrig-transient: add support for hrtimer

+Cc: Greg KH

On Sun, Apr 30, 2017 at 2:36 PM, David Lin <dtwlin@...gle.com> wrote:
> Hi,
>
> These patch series add the LED_BRIGHTNESS_FAST flag support for
> ledtrig-transient to use hrtimer so that platforms with high-resolution timer
> support can have better accuracy in the trigger duration timing. The need for
> this support is driven by the fact that Android has removed the timed_ouput [1]
> and is now using led-trigger for handling vibrator control which requires the
> timer to be accurate up to a millisecond. However, this flag support would also
> allow hrtimer to co-exist with the ktimer without causing warning to the
> existing drivers [2].
>
> David
>
> [1] https://patchwork.kernel.org/patch/8664831/
> [2] https://lkml.org/lkml/2015/4/28/260
>
> David Lin (3):
>   leds: Replace flags bit shift with BIT() macros
>   leds: Add the LED_BRIGHTNESS_FAST flag
>   led: ledtrig-transient: add support for hrtimer
>
>  Documentation/leds/leds-class.txt        |  5 +++
>  drivers/leds/trigger/ledtrig-transient.c | 59 +++++++++++++++++++++++++++++---
>  include/linux/leds.h                     | 13 +++----
>  3 files changed, 66 insertions(+), 11 deletions(-)
>
> --
> 2.13.0.rc0.306.g87b477812d-goog
>