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From: Gregor Boirie <gregor.boirie@parrot.com>
To: Jonathan Cameron <jic23@jic23.retrosnub.co.uk>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Jonathan Cameron <jic23@kernel.org>, <linux-iio@vger.kernel.org>
Subject: Re: using monotonic clok for timstamping
Date: Tue, 9 Feb 2016 15:19:28 +0100	[thread overview]
Message-ID: <56B9F570.1050108@parrot.com> (raw)
In-Reply-To: <56B9C826.1090309@parrot.com>

On 02/09/2016 12:06 PM, Gregor Boirie wrote:
> One remaining question is : how do we ensure sample and event timestamps
> consistency with respect to clock changes ? 2 suggestions:
> * reject the ability to select a new clock as long as an events 
> chardev is opened
>   or a buffered samples channel is enabled ;
Actually, this may be the only viable solution since some drivers save 
timestamps for
futur usage (see drivers/iio/accel/bmc150-accel-core.c). Changing 
reference clock
between 2 timestamping operations would lead to inconsistencies.

> * clock may be changed at any time since it could be implemented in an 
> atomic
>   way (a simple atomic_t can hold an int / clockid_t if I'm no wrong).

  reply	other threads:[~2016-02-09 14:19 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-03 10:55 Gregor Boirie
2016-02-03 11:22 ` Lars-Peter Clausen
2016-02-06 18:33   ` Jonathan Cameron
2016-02-08  9:55     ` Lars-Peter Clausen
2016-02-08 17:15       ` Jonathan Cameron
2016-02-09 11:06         ` Gregor Boirie
2016-02-09 14:19           ` Gregor Boirie [this message]
2016-02-09 20:49             ` Jonathan Cameron
2016-02-09 20:52           ` Lars-Peter Clausen
2016-02-09 21:02             ` Jonathan Cameron
2016-02-10  9:46             ` Gregor Boirie

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