[PATCH] clocksource: arm_global_timer: Allow DT to specify already reset timer counter

[Jassi Brar]

On 16 December 2015 at 12:29, Daniel Lezcano <daniel.lezcano at linaro.org> wrote:
> On 12/16/2015 05:11 AM, Jassi Brar wrote:
>>
>> On Tue, Dec 15, 2015 at 11:32 PM, Daniel Lezcano
>> <daniel.lezcano at linaro.org> wrote:
>>>
>>> On 11/25/2015 06:24 AM, Jassi Brar wrote:
>>>>
>>>>
>>>> The GT counter is common to every core in a cluster. There is a usecase
>>>> when Linux is spawned by a 'master' firmware/OS running on some core of
>>>> the same cluster and the GT is used by the both.
>>>>    Linux, upon boot, resetting the GT counter is obviously fatal to the
>>>> other OS. So provide a way for DT to tell Linux if it's running in that
>>>> 'slave' mode and must not reset the counter.
>>>>
>>>> Signed-off-by: Jassi Brar <jaswinder.singh at linaro.org>
>>>
>>>
>>>
>>> Hmm, I doubt that is a hardware description.
>>>
>> Its a regular 2core-1cluster platform. The master RTOS on cpu0
>> maintains the lifecycle of Linux on cpu1.
>>
>> 'No_Counter_Reset' is not a h/w thing, I agree, but I don't know how
>> to better convey that platform specific constraint.
>
>
> May be with a kernel parameter ?
>
The fact, that arch-timer driver does it via DT (see commit
65b5732d241b8), changes anything? :)

Thanks.