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microblaze: Added fdt chosen capability for timer

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This lets a dts author flag a particular timer in the system as the system timer.
If the chosen node contains a "system-timer=<&foo>" entry than that handle will
be used to determine the system timer. In no such entry exists then the first
found timer will be used (current behaviour).

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2011-12-12 14:02:47 +01:00
parent 9998517a27
commit 88d23b4462
1 changed files with 9 additions and 1 deletions
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10
arch/microblaze/kernel/timer.c
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@ -257,7 +257,15 @@ void __init time_init(void)
0
};
#endif
timer = of_find_compatible_node(NULL, NULL, "xlnx,xps-timer-1.00.a");
prop = of_get_property(of_chosen, "system-timer", NULL);
if (prop)
timer = of_find_node_by_phandle(be32_to_cpup(prop));
else
pr_info("No chosen timer found, using default\n");
if (!timer)
timer = of_find_compatible_node(NULL, NULL,
"xlnx,xps-timer-1.00.a");
BUG_ON(!timer);
timer_baseaddr = be32_to_cpup(of_get_property(timer, "reg", NULL));