[PATCH] audio: sai: Add Power Management support

[Mark Brown]

On Thu, Oct 30, 2014 at 03:30:40AM +0000, Li.Xiubo at freescale.com wrote:

> One more thing, if the device is not performance critical, then shouldn't we
> Take care of the cache memory consumption to determine using flat or rbtree
> Type ?

Yes, it's always fine to use a rbtree if it makes sense - it was just an
unusual choice for a device like this that didn't seem to be discussed.

Depending on the register map a flat cache can actually be more memory
efficient sometimes since there's some overhead for the rbtree data
structures, if you've just got one block of registers with no gaps a
flat cache is going to be a win there.
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