netdev - Re: [PATCH (sh-2.6) 1/4] clksource: Generic timer infrastructure

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Message-ID: <20110301202611.GC27107@n2100.arm.linux.org.uk>
Date:	Tue, 1 Mar 2011 20:26:11 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Stuart Menefy <stuart.menefy@...com>,
	Peppe CAVALLARO <peppe.cavallaro@...com>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH (sh-2.6) 1/4] clksource: Generic timer infrastructure

On Tue, Mar 01, 2011 at 05:43:19PM +0100, Arnd Bergmann wrote:
> On Tuesday 01 March 2011, Stuart Menefy wrote:
> > On 24/02/11 17:20, Arnd Bergmann wrote:
> > > Also, what is the difference between this and clkdev?
> > 
> > clkdev can be used to find a struct clk, which is fine if you just want to
> > read the time. In this instance we want to get interrupts from the timer
> > hardware, which isn't supported by the clk infrastructure.
> 
> (adding Russell to Cc)
> 
> Is this something that could sensibly be added to clk/clkdev?

I don't understand - why would anyone want to use clk/clkdev for timers.
clk/clkdev is all about those signals on the SoC which wiggle at regular
intervals between logic 0 and logic 1.  It's not about things which count,
which seems to be an entirely separate problem, and hence why there's
nothing to deal with interrupts or setting timeouts etc.
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