From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Lin Subject: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer Date: Wed, 13 Sep 2017 10:53:57 -0700 Message-ID: <20170913175400.42744-1-dtwlin@google.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: corbet@lwn.net, rpurdie@rpsys.net, jacek.anaszewski@gmail.com, pavel@ucw.cz, hdegoede@redhat.com, gregkh@linuxfoundation.org Cc: robh@kernel.org, romlem@google.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, David Lin List-Id: linux-leds@vger.kernel.org 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 Changes from v1 to v2: - Convert all the bit shifting flag in leds.h to use the BIT macro. - Removed inline modifiers for the timer helper function. 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 | 19 +++++----- 3 files changed, 69 insertions(+), 14 deletions(-) -- 2.14.1.581.gf28d330327-goog