[PATCH v9] iopoll: Introduce memory-mapped IO polling macros

On Mon, Dec 15 2014 at 03:31:20 PM, Mitchel Humpherys [off-list ref] wrote:

From: Matt Wagantall <redacted>

It is sometimes necessary to poll a memory-mapped register until its value
satisfies some condition. Introduce a family of convenience macros that do
this. Tight-looping, sleeping, and timing out can all be accomplished using
these macros.

Cc: Thierry Reding <redacted>
Cc: Will Deacon <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Robert Elliott <redacted>
Signed-off-by: Matt Wagantall <redacted>
Signed-off-by: Mitchel Humpherys <redacted>
---
v8..v9:
  - Added note in comments about max sleep time (Rob Elliott)

Sorry, just noticed that I somehow dropped these additional comments
that Rob requested...  Let me send a v10 that actually includes them.
Please ignore this version.


-Mitch

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