linux-kernel - Re: [PATCH 0/2] serial: 8250: add support for MediaTek BTIF controller

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Date:   Thu, 3 Aug 2017 01:37:50 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     <robh+dt@...nel.org>, <gregkh@...uxfoundation.org>,
        <jslaby@...e.com>, <jan.kiszka@...mens.com>,
        <heikki.krogerus@...ux.intel.com>, <hpeter@...il.com>,
        <vigneshr@...com>, <matthias.bgg@...il.com>,
        <devicetree@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-serial@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] serial: 8250: add support for MediaTek BTIF
 controller

On Wed, 2017-08-02 at 20:14 +0300, Andy Shevchenko wrote:
> On Thu, 2017-08-03 at 01:05 +0800, sean.wang@...iatek.com wrote:
> > From: Sean Wang <sean.wang@...iatek.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.
> 
> 
> 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.

	Sean

> > 
> > Sean Wang (2):
> >   dt-bindings: serial: Add MediaTek BTIF controller bindings
> >   tty: serial: 8250: Add MediaTek BTIF controller on MT7622 and MT7623
> >     SoC
> > 
> >  .../devicetree/bindings/serial/mtk-btif.txt        |  26 +++
> >  drivers/tty/serial/8250/8250_btif.c                | 224
> > +++++++++++++++++++++
> >  drivers/tty/serial/8250/Kconfig                    |   9 +
> >  drivers/tty/serial/8250/Makefile                   |   1 +
> >  4 files changed, 260 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/serial/mtk-
> > btif.txt
> >  create mode 100644 drivers/tty/serial/8250/8250_btif.c
> > 
>