[PATCH 4/7] tty: serial: support device tree in pxa

[Eric Miao]

On Wed, Jul 20, 2011 at 4:05 AM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Tue, Jul 19, 2011 at 01:53:53PM -0600, Grant Likely wrote:
>> On Tue, Jul 19, 2011 at 1:48 PM, Arnd Bergmann <arnd at arndb.de> wrote:
>> > On Tuesday 19 July 2011 13:40:10 Grant Likely wrote:
>> >> On Tue, Jul 19, 2011 at 10:24:47AM +0800, Haojian Zhuang wrote:
>> >> > Support both normal platform driver and device tree driver in serial pxa.
>> >> >
>> >> > Signed-off-by: Haojian Zhuang <haojian.zhuang at marvell.com>
>> >> > ---
>> >> >  drivers/tty/serial/Kconfig     |    4 +-
>> >> >  drivers/tty/serial/of_serial.c |   12 +++++
>> >> >  drivers/tty/serial/pxa.c       |   93 ++++++++++++++++++++++++++++++++++++++-
>> >> >  include/linux/serial_pxa.h     |   17 +++++++
>> >> >  4 files changed, 122 insertions(+), 4 deletions(-)
>> >> >  create mode 100644 include/linux/serial_pxa.h
>> >> >
>> >>
>> >> serial_pxa is already a platform_driver.  Instead of modifying
>> >> of_serial, an of_match_table should be added to this driver and it
>> >> should decode the DT data inside the existing probe hook.
>> >>
>> >> No need to create all of this extra infrastructure.
>> >
>> > Right. We should probably rename of_serial to 8250_of and remove the qpace
>> > parts from the driver.
>>
>> In fact, I think we've got about 3 devtree drivers for 8250 serial
>> ports.  I think it is about time for some consolidation work.  :-)
>>
>> I wonder if we can roll of_serial directly into the 8250.c driver.
>
> The original serial.c got split into 8250.c, plus several probe modules
> (8250_pnp.c, 8250_pci.c, etc) to get around the problem of lots of
> bus specific crap appearing in the main driver.  8250_of.c would follow
> on that theme.
>

Apart from the DMA support (which hasn't make it into mainline yet) and
a few other minor tweaks, the PXA serial can actually reuse the 8250.c
(actually it was where pxa serial driver forked IIRC).

Russell, what's inevitable to have a forked pxa serial driver?