linux-kernel - Re: [alsa-devel] [very-RFC 0/8] TSN driver for the kernel

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Message-ID: <20160623132805.GC7122@localhost.localdomain>
Date:	Thu, 23 Jun 2016 15:28:05 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Henrik Austad <henrik@...tad.us>
Cc:	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	alsa-devel@...a-project.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...aro.org>,
	linux-media@...r.kernel.org
Subject: Re: [alsa-devel] [very-RFC 0/8] TSN driver for the kernel

On Thu, Jun 23, 2016 at 12:38:48PM +0200, Henrik Austad wrote:
> Richard: is it fair to assume that if ptp4l is running and is part of a PTP 
> domain, ktime_get() will return PTP-adjusted time for the system?

No.

> Or do I also need to run phc2sys in order to sync the system-time
> to PTP-time?

Yes, unless you are using SW time stamping, in which case ptp4l will
steer the system clock directly.

HTH,
Richard