Hi Timur.
On 22 May 2015 at 00:33, Timur Tabi timur@codeaurora.org wrote:
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.
Thanks for your info, I think : right now , do what we can do, export the interface of arch_timer, If the arm maintainers don't like this way, we can find another way later or find a option as plan B.
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