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SubjectRe: [PATCH 3/4] watchdog: sa11x0/pxa: get rid of get_clock_tick_rate
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On 09/19/2016 03:36 PM, Russell King - ARM Linux wrote:
> On Mon, Sep 19, 2016 at 01:08:16PM -0700, Guenter Roeck wrote:
>> On Mon, Sep 19, 2016 at 09:12:14PM +0200, Robert Jarzmik wrote:
>>> The OS timer rate used for the watchdog can now be fetched from the
>>> standard clock API. This will remove the last user of
>>> get_clock_tick_rate() in both pxa and sa11x0 architectures.
>>>
>>> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
>>
>> Did you test this ? Potential problem, if built into the kernel, could be that
>> the clocks might not be ready by the time the driver is instantiated. Unless
>> this is converted to a platform driver, it won't be able to handle a
>> -EPROBE_DEFER from the clock subsystem.
>
> Really not a problem at all. The OSTIMER0 is required for the system
> tick, and if that's not present, the kernel will be without any kind
> of time keeping, so a missing watchdog driver is the least of the
> problems.
>
> Therefore, both PXA and SA11x0 register their clocks really early to
> ensure that OSTIMER0 is available by the time_init() stage, which is
> way before driver probe time.
>

You are right. And, at least in qemu, it actually works.

Thanks,
Guenter

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