On Wed, 2017-08-02 at 21:02 +0300, Andy Shevchenko wrote:

On Thu, 2017-08-03 at 01:37 +0800, Sean Wang wrote:

quoted

On Wed, 2017-08-02 at 20:14 +0300, Andy Shevchenko wrote:

quoted

On Thu, 2017-08-03 at 01:05 +0800, sean.wang at mediatek.com wrote:

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From: Sean Wang <sean.wang@mediatek.com>

This patchset introduces the support for MediaTek BTIF controller.

MediaTek BTIF controller is the serial interface similar to UART
but
it
works only as the digital device which is mainly used to
communicate
with
the connectivity module also called CONNSYS inside the SoC which
could
be
mostly found on those MediaTek SoCs with Bluetooth feature.

And the controller is made as being compatible with the 8250
register
layout so it tends to be integrated with existing 8250 core driver
and
have no requirement for the modem configuration additionally such
as
the
baud rate calculation and assignment.

+Cc: Arnd.

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Why it requires a separate driver?

8250_of is for DT enabled drivers.

Hi, Andy

thanks for your information

the hardware is not completely identical to 8250 device, 
it has extra registers belonged to platform control such as internal
loopback, dma disable/enable, sleep/wakeup setup and so on, so I
create
it as a separate driver.

Over all 200+ LOCs I didn't see any of the above except loopback, which
is one property that can be easily added to 8250_of.c.

Moreover, if you have more code coming I would suggest you to split
8250_of to library and driver parts and re-use stuff from there.

Arnd, what is your opinion about new 8250 OF based drivers?

Hi, Andy

many thanks for the detailed guidance.
I will turn into reusing 8250 OF stuff in the next version and look
forward to any idea from Arnd how to do with 8250 OF driver to add
specific programming/data for those devices using 8250 OF.

	Sean