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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