Messages in this thread | | | Date | Thu, 21 May 2015 11:33:01 -0500 | From | Timur Tabi <> | Subject | Re: [PATCH v2 6/7] Watchdog: introduce ARM SBSA watchdog driver |
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On 05/21/2015 11:12 AM, Fu Wei wrote: >> > >> >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
The rate isn't the problem. It's the current timestamp counter. The only way to get that is with either arch_counter_get_cntvct() or arch_timer_read_counter(). I'm not sure which of the two functions is better. However, arch_timer_read_counter() is really just a function pointer that points to arch_counter_get_cntvct().
Also, clk_get_rate() only works if you have a real clk object. I've said this before many times, but on my ACPI platform, there are no clk objects. Clocks are handled by UEFI.
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