On Wed, Apr 16, 2014 at 12:13 PM, Sergei Ianovich [off-list ref] wrote:

pxa2xx-uart was a separate uart platform driver. It was declaring
the same device names and numbers as 8250 driver. As a result,
it was impossible to use 8250 driver on PXA SoCs.

Upon closer examination pxa2xx-uart turned out to be a clone of
8250_core driver.

Workaround for Erratum #19 according to Marvel(R) PXA270M Processor
Specification Update (April 19, 2010) is dropped. 8250_core reads
from FIFO immediately after checking DR bit in LSR.

Signed-off-by: Sergei Ianovich <redacted>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: James Cameron <redacted>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 Resenging together with the rest of the series as the series
 breaks without this one at [PATCH 12/21]

Whatever happened with merging this? I'm asking because either this or
fixes to PXA uart are needed to coexist with the 8250 driver and for
earlycon to work.

Rob