On Tue, 2016-03-01 at 09:54 -0800, [email protected] wrote:
> From: Aaron Marburg <[email protected]>
>
> The USOPTL4-4P and USOPTL4-2P USB-to-quad/dual RS-485/422 hubs use the
> Moschip 7840/7820. For correct operation in RS-485, the chip must be
> configured in “RS-485 mode” through the scratchpad register as per the
> datasheet. This strobes the DTR line on transmission, enabling the driver
> on the RS485 transceiver chip.
I think if you include a config option to do this, you should
also enable the canonical way of using an ioctl(). That means
you need to support rs485_config().
Regards
Oliver
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