On Fri, Aug 18, 2017 at 12:56:59PM +1000, Stuart Longland wrote:
> This introduces the `uart_mode` sysfs attribute as seen in the `io_ti`
> USB serial driver, allowing this USB serial interface to be switched
> between RS-232, 2-wire RS-485 and 4-wire RS-485.
>
> /sys/class/tty/ttyUSB${num}/device/uart takes a single integer:
>
> 0: RS-232 mode (default for RS-232-compatible dongles)
> 1: RS-485 2w mode (default for RS-485-only dongles)
> 2: RS-485 4w mode / RS-422 mode
>
> Write this *before* opening your serial device.
Please don't create random driver-specific sysfs files for something as
generic as this type of userspace api.
Also, you didn't create a Documentation/ABI/ file describing this, so
even if I wanted to take it, I couldn't :)
Anyway, work on a "real" solution for this for all serial devices
please.
thanks,
greg k-h
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