Re: [PATCH v2 6/7] Watchdog: introduce ARM SBSA watchdog driver
From: Timur Tabi <hidden>
Date: 2015-05-21 16:33:09
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linux-watchdog, lkml
On 05/21/2015 11:12 AM, Fu Wei wrote:
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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. -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html