Re: [PATCH/RFC] 8250: Auto RS485 direction control

[Grant Edwards <grante@visi.com>]

On 2008-08-04, Grant Edwards <grante@visi.com> wrote:
> On 2008-08-04, Laurent Pinchart <laurentp@cse-semaphore.com> wrote:
>> On Monday 04 August 2008, Tosoni wrote:
>>> About the flags names -- CARTS, UART_FCTR_RS485
>>> 
>>> May I suggest CRTSTOGGLE since it is known by that kind of name in other
>>> OS's :-)
>>
>> I like Russell's proposal of sticking to CRTSCTS and adding options to setserial:
>>
>>> Should CRTSCTS be a global "enable some kind of flow control" bit and
>>> setserial be used to configure the actual flow control method
>>> (conventional RTS/CTS, DTR/DSR, alternate RTS/CTS, RS485 on RTS,
>>> RS485 on DTR) ?
>>
>> Any opinion on that ?
>
> Opposed.
>
>  1) CRTSCTS means something quite specific.  Rather than
>     overload that name for something unrelated, create a new
>     mode bit for the new mode.

Besides, there are often times when you want _both_ RTS toggle
and CTS flow control.  If both RTS toggle and RTSCTS flow
control are set, the "toggle" function would have priority
control of the RTS pin.

-- 
Grant Edwards                   grante             Yow! Was my SOY LOAF left
                                  at               out in th'RAIN?  It tastes
                               visi.com            REAL GOOD!!