linux-kernel - Re: [PATCH v3] tty: serial: don't do termios for BTIF

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Message-ID: <20200422180900.GA3454664@kroah.com>
Date:   Wed, 22 Apr 2020 20:09:00 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     sean.wang@...iatek.com
Cc:     jslaby@...e.com, andriy.shevchenko@...ux.intel.com,
        mika.westerberg@...ux.intel.com, sr@...x.de, arnd@...db.de,
        matthias.bgg@...il.com, tthayer@...nsource.altera.com,
        linux-mediatek@...ts.infradead.org, linux-serial@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Steven Liu <steven.liu@...iatek.com>,
        Ryder Lee <ryder.lee@...iatek.com>
Subject: Re: [PATCH v3] tty: serial: don't do termios for BTIF

On Thu, Apr 23, 2020 at 02:02:08AM +0800, sean.wang@...iatek.com wrote:
> From: Sean Wang <sean.wang@...iatek.com>
> 
> Bluetooth Interface (BTIF) is designed dedicatedly for MediaTek SOC with
> BT in order to be instead of the UART interface between BT module and Host
> CPU, and not exported to user space to access.
> 
> As the UART design, BTIF will be an APB slave and can transmit or receive
> data by MCU access, but doesn't provide termios function like baudrate and
> flow control setup.

Why does it matter?  If the connection isn't exported to userspace, who
would run those termios functions on the port?

thanks,

greg k-h