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SubjectRe: [PATCH v2 6/7] Watchdog: introduce ARM SBSA watchdog driver
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.

--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.


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