Re: [PATCH] uart: pl011: Add support to ZTE uart

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On Fri, Mar 13, 2015 at 01:41:02PM -0400, Peter Hurley wrote:
> I think this would be much cleaner keeping the existing register index
> symbolic constants and using a remapping LUT with inline i/o accessors.
> 
> Plus it has the advantage of disallowing certain indexes which are not
> mapped (rather than an accidental alias).
> 
> I realize that was not the original model set forth but I don't think
> the original model contemplated a complete remap.

In that case, we will want to ensure that we cache the data register
and flag register iomem pointer in loops, so we don't have to
constantly reload the base and offsets.

This code gets run on some fairly slow ARM systems - including entirely
FPGA based systems.

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