Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH (sh-2.6) 1/4] clksource: Generic timer infrastructure | Date | Tue, 1 Mar 2011 21:41:26 +0100 |
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On Tuesday 01 March 2011 21:26:11 Russell King - ARM Linux wrote: > 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.
Ok, I see. I had mixed the two concepts. The clkdev infrastructure seemed like a nice way to connect a source and a consumer of a timer, but you're right that it's an entirely separate thing, and as Thomas said, it's probably not needed either.
Arnd
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