Guenter Roeck [off-list ref] writes:

On 09/19/2016 03:36 PM, Russell King - ARM Linux wrote:

quoted

On Mon, Sep 19, 2016 at 01:08:16PM -0700, Guenter Roeck wrote:

quoted

On Mon, Sep 19, 2016 at 09:12:14PM +0200, Robert Jarzmik wrote:

quoted

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.

Hi Guenter,

Yes, it was tested on pxa25x (lubbock) and pxa27x (mainstone).

Cheers.

-- 
Robert