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

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Message-Id: <201008191429.50008.arnd@arndb.de>
Date:	Thu, 19 Aug 2010 14:29:49 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Richard Cochran <richardcochran@...il.com>
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 Thursday 19 August 2010, Richard Cochran wrote:
> 
> On Wed, Aug 18, 2010 at 05:02:03PM +0200, Arnd Bergmann wrote:
> > You might want to use callbacks for these system calls that you
> > can register to at module load time, like it is done for the
> > existing syscalls.
> 
> Can you point me to a specific example?

The struct k_clock contains callback functions to clock source
specific implementations of the syscalls and other functions.
Adding a new clock source that is (potentially) implemented
as a module means you have to define a new k_clock in that module
that you register using register_posix_clock.

If you need additional syscalls to be implemented by the same
module, you can put more callback functions into struct k_clock
that would then only be implemented by the new module.

> > The simpler way (e.g. for testing) is using Kconfig dependencies, like
> > 
> > config PTP
> >       bool "IEEE 1588 Precision Time Protocol"
> > 
> > config PPS
> >       tristate "Pulse per Second"
> >       depends on PTP || !PTP
> > 
> > The depends statement is a way of expressing that when PTP is enabled,
> > PPS cannot be a module, while it may be a module if PTP is disabled.
> 
> THis did not work for me.
> 
> What I got was, in effect, two independent booleans.

Hmm, right. I wonder what I was thinking of then.

You can certainly do

config PTP
	bool "IEEE 1588 Precision Time Protocol"
	depends on PPS != m

but that will hide the PTP option if PPS is set to 'm', which is normally
not what you want.

	Arnd
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