On Tuesday 16 August 2011, Jamie Iles wrote:

The Synopsys DesignWare 8250 is an 8250 that has an extra interrupt that
gets raised when writing to the LCR when busy.  To handle this we need
special serial_out, serial_in and handle_irq methods.  Add a new
function serial8250_use_designware_io() that configures a uart_port with
these accessors.

Cc: Alan Cox <redacted>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jamie Iles <redacted>

Hmm, this looks about as good as the solution that I had in mind (doing
a new platform_driver). I can't any obvious advantages either way, so
I guess you get to have your version ;-)

Acked-by: Arnd Bergmann <arnd@arndb.de>