linux-kernel - Re: [PATCH 1/5] ptp: Added a brand new class driver for ptp clocks.

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Date:	Wed, 18 Aug 2010 16:04:40 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	john stultz <johnstul@...ibm.com>, linuxppc-dev@...ts.ozlabs.org,
	Rodolfo Giometti <giometti@...ux.it>, netdev@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Krzysztof Halasa <khc@...waw.pl>
Subject: Re: [PATCH 1/5] ptp: Added a brand new class driver for ptp clocks.

On Tue, Aug 17, 2010 at 01:36:29PM +0200, Arnd Bergmann wrote:
> On Tuesday 17 August 2010, Richard Cochran wrote:
> > I've been looking at offering the PTP clock as a posix clock, and it
> > is not as hard as I first thought. The PTP clock or clocks just have
> > to be registered as one of the posix_clocks[MAX_CLOCKS] in
> > posix-timers.c.
> 
> Ok sounds good.

I've been working turning the PTP stuff into syscalls, but here is a
little issue I ran into. The PTP clock layer wants to call the PPS
code via pps_register_source(), but the PPS can be compiled as a
module. Since the PTP layer is now offering syscalls, it must always
be present in the kernel. So I need to make sure that the PPS is
either absent entirely or staticly linked in.

How can I do this?

Thanks,

Richard
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