linux-kernel - [RFC v8 19/28] clockevents: introduce CLOCK_EVT_FEAT_NO

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Message-Id: <20161119161036.12679-8-nicstange@gmail.com>
Date:   Sat, 19 Nov 2016 17:10:27 +0100
From:   Nicolai Stange <nicstange@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     John Stultz <john.stultz@...aro.org>, linux-kernel@...r.kernel.org,
        Nicolai Stange <nicstange@...il.com>
Subject: [RFC v8 19/28] clockevents: introduce CLOCK_EVT_FEAT_NO_ADJUST flag

Upcoming changes to the clockevent core will make it adjusting a clockevent
device's mult/shift pair in order to compensate for NTP corrections made
by the timekeeping core.

For certain devices this behaviour is unwanted. Introduce the
CLOCK_EVT_FEAT_NO_ADJUST flag that, when being set, will cause a clockevent
device to be excluded from those adjustments.

Signed-off-by: Nicolai Stange <nicstange@...il.com>
---
 include/linux/clockchips.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 5c4670a..76fc51b 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -66,6 +66,12 @@ enum clock_event_state {
  */
 # define CLOCK_EVT_FEAT_HRTIMER		0x000080
 
+/*
+ * Clockevent device's mult/shift pair shall not get adjusted in order
+ * to compensate for NTP corrections made in the timekeeping core.
+ */
+# define CLOCK_EVT_FEAT_NO_ADJUST		0x000100
+
 /**
  * struct clock_event_device - clock event device descriptor
  * @event_handler:	Assigned by the framework to be called by the low
-- 
2.10.2