Messages in this thread | | | Date | Fri, 22 May 2015 00:12:21 +0800 | Subject | Re: [PATCH v2 6/7] Watchdog: introduce ARM SBSA watchdog driver | From | Fu Wei <> |
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Hi Guenter,
On 21 May 2015 at 23:59, Guenter Roeck <linux@roeck-us.net> wrote: > On Thu, May 21, 2015 at 11:46:53PM +0800, Fu Wei wrote: >> Hi Guenter, >> > [ ... ] > >> >> >> + >> >> >> + /* >> >> >> + * Try to determine the frequency from the arch_timer interface >> >> >> + */ >> >> >> + clk = arch_timer_get_rate(); >> >> > >> >> > >> >> > arch_timer_get_rate() does not seem to be exported. Did you try to build >> >> > the driver as module ? >> >> >> >> yes, I have built it as a ko module, that is why I made a patch to >> >> export this interface in the first patch of this patchset >> >> >> >> but I will confirm it again :-) >> >> >> > Guess I'll give it a try myself. I don't really understand how this >> > can work unless arch_timer_get_rate() is exported in your tree. >> >> yes, I have exported it , I think it make sense to export it. >> Because other driver maybe need to get system counter info >> >> Do you agree ? :-) >> > I don't think it is for me to agree or not. The arm maintainers > will need to be involved. You can not just export such a function > without maintainer Ack.
yes, I have added Mark Rutland in the CC list when I sent this patchset . He added the "arch_timer_get_rate();" in the arch timer driver. See if he can provide some suggestion. :-)
maybe I should add some more arm arch timer maintainers to get more help on this :-)
> > Having said that, my personal preference would be for the counter > and rate to be exported through the clock subsystem (ie with > clk_get_rate). But that would still not provide the current counter > value, so maybe that isn't even possible.
I will try to make a patch for this, If the arm maintainers don't like exporting "arch_timer_get_rate();"
But your thought is good, the clk_get_rate is the best way to do for now
> > Thanks, > Guenter
-- Best regards,
Fu Wei Software Engineer Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch Ph: +86 21 61221326(direct) Ph: +86 186 2020 4684 (mobile) Room 1512, Regus One Corporate Avenue,Level 15, One Corporate Avenue,222 Hubin Road,Huangpu District, Shanghai,China 200021
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