Timur Tabi wrote:
The macro spin_event_timeout() takes a condition and timeout value
(in microseconds) as parameters. It spins until either the condition is true
or the timeout expires. It returns zero if the timeout expires first, non-zero
otherwise.
This primary purpose of this macro is to poll on a hardware register until a
status bit changes. The timeout ensures that the loop still terminates if the
bit doesn't change as expected. This macro makes it easier for driver
developers to perform this kind of operation properly.
Signed-off-by: Timur Tabi <ti...@freescale.com>
---
v5: ported to arch/powerpc, made it powerpc-specific, eliminated udelay
Why make it powerpc-specific? This would be nice to have in
arch-independent code.
-Scott
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