Messages in this thread | | | Date | Wed, 27 Apr 2016 11:41:10 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH v1] ARM: clocksource: make ARM_GLOBAL_TIMER selectable |
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On Tue, Apr 26, 2016 at 10:35:08PM +0300, Grygorii Strashko wrote: > On 04/26/2016 07:02 PM, Liviu Dudau wrote: > > Well, SoC-B has the GT *and* the DT node, so what is the problem with > > enabling it for SoC-B? If there are reasons not to use the Global Timer > > on SoC-B, surely a better option would be to mark it in DT with status = "disabled"; > > This was rejected [2]. DT describes HW and if it is functional the status = "disabled" > is not good choice. > ARM GT can't be used as clocksource/sched_clock/clockevent when CPUFreq or > CPUIdle are enabled :(, and this is Linux specific functionality and > not HW description.
Sorry, but we don't want to have to disable drivers in the kernel just because one platform has a problem (consider the single zImage case where it may be required that the global timer is enabled for some platform to boot - it becomes mandatory in single zImage at that point.)
Maybe a linux-specific property is needed here - "linux,low-power-unstable" or something like that?
-- RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.
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