[PATCH] spi: xilinx: Use standard num-cs binding

[Mark Brown]

On Fri, Jan 16, 2015 at 01:55:14PM +0100, Michal Simek wrote:
> Use standard num-cs binding property and setup
> "xlnx,num-ss-bits" as deprecated.

Why?  These properties mean different things - num-cs is a bit confused
and is the total number of available chip selects for the system (which
could include GPIOs) while num-ss-bits is the size of the bitfield
(which could include things not actually mapped out properly/successfully 
or something if the hardware designers were feeling particularly inspired).

I'm not convinced num-cs ever made any sense.
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