[PATCH] spi: imx: Add pm-runtime autosuspend

[Mark Brown]

On Thu, Apr 28, 2016 at 01:03:31PM +0200, Markus Pargmann wrote:
> Currently for each transfer the two clocks are enabled and disabled. For
> heavy SPI usage this can lead to a significant overhead.

Really?  If the system is loaded the normal effect is that we will get
an equivalent effect from the SPI message thread - I'm curious what the
numbers are here.  This doesn't seem like something we should be doing
in individual drivers if it makes a difference.
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