Messages in this thread | | | From | Heiko Stübner <> | Subject | Re: [PATCH v2 4/4] clocksource: dw_apb_timer_of: use clocksource_of_init | Date | Tue, 4 Jun 2013 17:06:29 +0200 |
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Am Dienstag, 4. Juni 2013, 16:21:20 schrieb Jamie Iles: > Hi Heiko, > > On Tue, Jun 04, 2013 at 11:38:42AM +0200, Heiko Stübner wrote: > > dw_apb_timer_init used to search the devicetree for matching timer > > devices, making calls to it from board files necessary. > > > > Change the dw_apb_timer_init to work with CLOCKSOURCE_OF_DECLARE. > > With this change the function gets called once for each timer node > > and tracks these number of calls to attach clockevent and clocksource > > devices to the nodes. > > > > Also remove the calls to dw_apb_timer_init from all previous users, as > > clocksource_of_init is the default for init_time now. > > > > Tested on the upcoming rk3066 code. > > > > Signed-off-by: Heiko Stuebner <heiko@sntech.de> > > Acked-by: Rob Herring <rob.herring@calxeda.com> > > Acked-by: Arnd Bergmann <arnd@arndb.de> > > --- > > ... > > > -void __init dw_apb_timer_init(void) > > +static int num_called; > > +static void __init dw_apb_timer_init(struct device_node *timer) > > > > { > > > > - struct device_node *event_timer, *source_timer; > > - > > - event_timer = of_find_matching_node(NULL, osctimer_ids); > > - if (!event_timer) > > - panic("No timer for clockevent"); > > - add_clockevent(event_timer); > > - > > - source_timer = of_find_matching_node(event_timer, osctimer_ids); > > - if (!source_timer) > > - panic("No timer for clocksource"); > > - add_clocksource(source_timer); > > - > > - of_node_put(source_timer); > > + switch (num_called) { > > + case 0: > > + pr_debug("%s: found clockevent timer\n", __func__); > > + add_clockevent(timer); > > + of_node_put(timer); > > + break; > > + case 1: > > + pr_debug("%s: found clocksource timer\n", __func__); > > + add_clocksource(timer); > > + of_node_put(timer); > > + init_sched_clock(); > > + break; > > + default: > > + break; > > + } > > > > - init_sched_clock(); > > + num_called++; > > > > } > > > > +CLOCKSOURCE_OF_DECLARE(pc3x2_timer, "picochip,pc3x2-timer", > > dw_apb_timer_init); +CLOCKSOURCE_OF_DECLARE(apb_timer, > > "snps,dw-apb-timer-osc", dw_apb_timer_init); > > I think maybe we also want CLOCKSOURCE_OF_DECLARE() instances for the > contents of sptimer_ids for completeness, otherwise looks good.
Hmm ... difficult.
As you can see, currently we call init_sched_clock when the second timer is found, which then tries to find the sptimer or uses the clocksource as sched_clock.
So to use CLOCKSOURCE_OF_DECLARE for the sptimer the init_sched_clock call would need to move to its init function. So on system without sptimer (like mine) this third call would never happen, and the system would be missing a sched_clock.
Or I just don't see the solution currently. In any case this could probably be handled by someone with the relevant hardware to test ;-) .
> Acked-by: Jamie Iles <jamie@jamieiles.com>
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