On Wednesday 03 February 2016 09:09 PM, Rob Herring wrote: > On Wed, Feb 3, 2016 at 2:04 AM, Vineet Gupta <Vineet.Gupta1-HKixBCOQz3hWk0Htik3J/w at public.gmane.org> wrote: >> Hi Rob, >> >> On Wednesday 03 February 2016 03:33 AM, Rob Herring wrote: >>> On Tue, Feb 02, 2016 at 04:28:52PM +0530, Vineet Gupta wrote: >>>> +Required properties: >>>> + >>>> +- compatible : should be "snps,arc-timer0" >>> >>> timer0 and timer1 are different h/w blocks, not just different >>> instances? >> >> Functionality wise they are identical (only the address of aux regs used to >> program them are different). Either can be configured to interrupt-on-limit or >> free-run-and-wrap-around. So we can indeed consider them 2 instances. ARC Linux >> uses timer0 for tick handling, timer1 for gtod. >> >> Do you prefer they not be differentiated as timer0 and timer1 ? >> >> So we have >> >> CLOCKSOURCE_OF_DECLARE(arc_clkevt, "snps,arc-timer0", arc_clockevent_setup); >> CLOCKSOURCE_OF_DECLARE(arc_timer1, "snps,arc-timer1", arc_cs_setup_timer1); >> >> I don't know how to achieve above, by keeping the DT names the same. > > You just need a single CLOCKSOURCE_OF_DECLARE which will be called > twice. On the first call, setup one timer and on the 2nd call setup > the other one. IIRC the sp804 timer has something similar. > > You'll need a unit address in the node name to distinguish them. So this is just to distinguish them in DT, but the callback uses a static counter to do 1st vs. 2nd (and this unit address is not really exposed to code) - correct ?
